Metabolic, zootechnical, and health profile of Girolando calves conceived through in vitro fertilizationABSTRACT:
This study determined the zootechnical, metabolic, and health performance of Girolando calves born with high or low birth weight, conceived through in vitro fertilization. The study was carried out on a commercial dairy farm located in Passos, Minas Gerais, Brazil. For this, a hundred Girolando calves were divided into two groups: The Control, which consisted of calves that were born weighing ≤ 35 kg; and high birth weight (HBW) calves, which were born weighing > 35 kg. The calves were monitored for zootechnical parameters; epidemiological indices, for diseases such diarrhea and pneumonia; as well as serum concentrations of aspartate aminotransferase, alanine aminotransferase, alkaline phosphatase, gamma-glutamyl transferase, cholesterol, triglycerides, paraoxonase1, albumin, urea, and globulin. Calves from the HBW group had a higher general mortality rate, but no effects on the zootechnical performance or metabolism were observed. The results obtained allow us to conclude that Girolando calves generated by IVF and heavier at birth have a greater chance to present diseases such as omphalophlebitis, tympany, and bovine parasitic sadness, and have a higher rate of general mortality. Conversely, birth weight of the calves does not influence diarrhea or pneumonia, the zootechnical performance, or the metabolism.
Key words: neonates; bovine; metabolism; zootechnical performance; health
RESUMO:
Este estudo determinou o desempenho zootécnico, metabólico e saúde de bezerras Girolando nascidas com alto ou baixo peso, concebidas por fertilização in vitro. O estudo foi realizado em uma fazenda leiteira comercial localizada em Passos, Minas Gerais, Brasil. Cem bezerras Girolando foram divididas em dois grupos: Controle, que consistiu em bezerras que nasceram com peso ≤ 35 kg; e HBW, bezerras que nasceram com peso > 35 kg. As bezerras foram monitoradas quanto aos parâmetros zootécnicos; índices epidemiológicos para doenças como diarreia e pneumonia; bem como as concentrações séricas de aspartato aminotransferase, alanina aminotransferase, fosfatase alcalina, gama-glutamil transferase, colesterol, triglicérides, paraoxonase1, albumina, uréia e globulina. As bezerras do grupo HBW apresentaram maior taxa de mortalidade, mas nenhum efeito no desempenho zootécnico ou metabolismo foram observados. Os resultados permitem concluir que bezerras Girolando provenientes de FIV que nascem mais pesadas têm maior chance de apresentar doenças, como onfaloflebite, timpanismo e tristeza parasitária bovina, tendo uma maior taxa de mortalidade geral. Porém, o peso ao nascimento das bezerras não influenciou a ocorrência de diarreia ou broncopneumonia, o desempenho zootécnico e o perfil metabólico.
Palavras-chave: neonatos; bovino; metabolismo; desempenho zootécnico; saúde.
INTRODUCTION:
The use of reproductive biotechnologies has been increasingly frequent in the Brazilian beef and dairy cattle farms, motivated by the necessity to meet the market demand and improve the genetic potential of herds (VIANA, 2019). In vitro fertilization (IVF) is a biotechnique that accelerates the process of genetic selection and enhances the participation of bovine females in the process of genetic improvement of herds. (VARAGO et al., 2008; BONILLA et al., 2014). However, the technique also has its drawbacks such as lower efficiency in embryo implantation, atypical placental development (BERTOLINI et al., 2004; SIQUEIRA et al., 2009), greater fetal development and, mainly, a higher birth weight (BONILLA et al., 2014).
Large offspring syndrome (LOS) is a fetal overgrowth condition in bovine animals, most often observed in offspring conceived with the use of reproductive technologies such as IVF and somatic cell nuclear transfer (SCNT). Different culture media cause transcript abundance changes of several developmentally important genes involved in cell-cell junctions, transport, RNA processing, and stress in bovine embryos (LI et al., 2019). Consequently, in addition to greater weight at birth, an abnormal enlargement of organs has been observed in animals with overgrowth, for example, in their hearts, livers, and kidneys (CHEN et al., 2013), which may cause metabolic changes in these animals.
Although, high birth weight may be associated with an increase in the average daily gain and height of calves (SWALI & WATHES, 2006), this condition may also be a risk factor for increasing dystocia, due to the incompatibility between the size of the calf and the mother’s pelvis (PAPUTUNGAN et al., 2000). Consequences of dystocia may include neonatal asphyxia, metabolic and respiratory acidosis, reduced immunoglobulin absorption, increased susceptibility to diseases, and death (JACOBSEN et al., 2000).
High birth weight is associated with perinatal mortality in calves (JOHANSON & BERGER, 2003), having a great economic impact (MEYER et al., 2001; SCHILD et al., 2020). In Holstein cattle, it was demonstrated that lower birth weight tends to have a lower risk of mortality, otherwise, calves with around or above average birth weight have an exponentially increased risk of mortality (JOHANSON & BERGER, 2003). These facts support the hypothesis of this study that high birth weight IVF calves have a higher predisposition toward health disorders.
Although, other studies investigate the influence of birth weight on calf health (SWALI & WATHES, 2006; GLOVER et al., 2019), there are still a few studies that correlate this parameter with the performance and metabolic profile of neonates from IVF. Thus, due to the great importance of the Girolando breed for dairy production, as well as due to the increasing use of reproductive biotechnologies in dairy farms, an evaluation of the effects of these techniques on the health and initial zootechnical performance become important/ to contribute to the decision-making within the production system. In this sense, this study determined the influence of birth weight on the metabolic, zootechnical, and health profile of Girolando calves conceived through IVF.
MATERIALS AND METHODS:
The study was conducted on a commercial dairy farm located in Passos, Southern Minas Gerais, Brazil. To conduct this, one hundred Girolando female calves, kept in a tropical (Argentinean) calf house system, were used. A shade cloth, a trough for feed supply, and a bottle for milk and water intake, were all present for individual use. The management of calves was described by WEILLER et al. (2021).
All calves were conceived through IVF, from a cross between the Holstein and Gir breeds, utilizing half Holstein-Gir donors (n = 51) and Gir donors (n = 49). For the IVF procedure, semen from nine Holstein bulls (bull “A” to “I”) were used (A: 19 vs. 20; B: 7 vs. 6; C: 16 vs. 18; D:1 vs. 0; E:1 vs. 0: F: 1 vs. 2; G: 2 vs. 1; H: 3 vs.2, and I: 0 vs. 1), resulting in calves that were three-fourth Holstein-Gir (n = 51) and half Holstein-Gir (n = 49). All bulls used in this study had the expected difference in progeny positive for calving ease. The oocyte donors and recipients were cows from the same property, so all were subjected to the same climatic conditions. Recipients were primiparous (n = 55) or multiparous (two or more calvings, n = 45) cows Holstein--Gir (half n = 23; three-fourths n = 69; five-eighths n = 4; seven-eighths n = 4). All recipients were cows presenting an average milk production of 20 liters/day, with body condition score between 2.5 and 3.5 (WILDMAN et al., 1982) at the moment of embryo transfer. The in vitro production system was the same throughout the study and fresh embryos were transferred from May to September 2017.
For the study, the animals were distributed into two groups, according to the birth-weight criterion. Given this, at birth, all calves were weighed using a tape measure for medium-sized animals, obtaining an average weight of 35.45 ± 4.6 kg and a median weight of 35.50 kg. Using the birth weights, the calves were included into two distinct groups, according to the average weight of Girolando females, which is 29.57 ± 4.2 kg at birth (OLIVEIRA & NOGUEIRA, 2006): Control (n = 50) - including calves that were born weighing 35 kg or less; and HBW group (n = 50) - including calves with a birth weight higher than 35 kg. For the composition of these two groups, the median was used as a reference measure. The bull semen, recipient parity, and the degree of blood of the Holstein-Gir were evenly distributed between the groups.
Assessing passive transfer of immunity
Failure of passive transfer of immunity (FPTI) was determined in the calves (n = 100) through assessment of their serum levels of total protein (TP). For this, blood was collected through jugular venipuncture, between 24 and 48 hours of life, using a vacuum system and tubes, without any anticoagulant (Vacuplast CRAL, São Paulo, Brazil). After collection, the samples were centrifuged for 10 minutes at a speed of 2183 x g to obtain the serum, and analyzed in an optical refractometer. To determine the occurrence of FPTI, the parameter of 5.5 g/dL was used as a cutoff point, as determined by BUCZINSKI et al. (2018).
Occurrence of diseases
All calves were monitored daily by the responsible Veterinarian of the study, from birth to 80 days of life, in order to diagnose diarrhea, respiratory, or other diseases (bloat, tick fever, and omphalophlebitis). For the determination of the presence of diarrhea, the feces were classified on a scale from 0 to 4 according to the methodology recommended (TEIXEIRA et al., 2015), with score 0 characterized as normal feces and score 4 characterized as profuse diarrhea, with watery and bloody feces. Whenever calves had a feces score ≥ 2, they were characterized to be suffering from diarrhea. Diagnosis of respiratory diseases was performed according to LOVE et al. (2014). Other than the cases of diarrhea and bronchopneumonia, the remaining diseases that occurred during the experimental period were all classified as “other diseases”, and included cases of omphalophlebitis, ruminal tympany, and bovine parasitic sadness. The diseases were treated in accordance with the protocol determined by the farm Veterinarian, which was similar for both groups.
Based on the records, it was possible to determine: Morbidity (number of animals that became sick divided by the total number of animals), mortality (number of animals that died divided by the total number of animals), lethality (number of animals that died divided by the number of animals that had the disease), and recurrence (number of animals that had two or more diarrhea attacks over the course of the study).
Zootechnical assessments
The zootechnical evaluations were carried out on 41 randomly selected calves (Control: 22; HBW: 19). Body weight was determined at birth (between 24-48 hours), weekly, until 30 days of age, followed by evaluations on days 42, 60, and 80. Calf weights were estimated using a heart girth tape graduated in kilograms, placed vertically behind the forelimb (WOOD et al., 2015). The thoracic perimeter, withers height and width of the rump were measured using a tape measure. Assessments were performed weekly, up to 30 days of life (including birth), followed by the last assessment at 60 days. From the body weight assessment, the average daily gain (ADG) was determined.
Biochemical analysis
Total plasma proteins, albumin, triglycerides, cholesterol, and urea concentrations, as well as the activity of enzymes gamma-glutamyl transfererase (GGT), paraoxonase 1 (PON1), aspartate aminotransferase (AST), alanine aminotransferase (ALT), and alkaline phosphatase (ALP) were evaluated in the same 41 calves (Control: 22; HBW: 19). For this purpose, blood was collected using a Vacutainer system and tubes, without anticoagulant (Vacuplast CRAL, São Paulo, Brazil), via the jugular vein, at the following times: At birth (between 24 and 48 hours) and on days 7, 14, 21, 28, and 60. All collections were performed in the morning, before food intake. After blood collection, all the samples were sent to the laboratory, centrifuged at 2183 x g, and immediately frozen for further analysis. Except for PON1, all samples were analyzed in an automatic biochemical analyzer Labmax Plenno (Labtest Diagnostica, Minas Gerais, Brazil) using commercial colorimetric kits from the same company. The procedures were performed according to the manufacturer’s recommendation. To determine PON1 activity, a previously described protocol was used (BROWNE et al., 2007).
Statistical analysis
Body weight, thoracic perimeter, withers height, width of the croup, and biochemical results were analyzed, using the Analysis of Variance (ANOVA), with repeated measures, followed by the Tukey-Kramer multiple comparison test, considering the group, time of collection, and their interactions as fixed effects, and the animal as random effect. Data that did not have a normal distribution were transformed to log10 (i.e., PON1, GGT, and cholesterol).
Categorical variables such as FPIT, morbidity, mortality, lethality, and disease recurrence were assessed using the Chi-square test. The data obtained were analyzed using the NCSS 97 Statistical Program, being considered significant when P < 0.05. The relative risk was calculated (incidence in the HBW group/incidence in the control group) using a 95% confidence interval. Values were described as mean ± standard error.
RESULTS:
There were no differences on failure in transfer of passive immunity between the Control and HBW groups (FPIT: 4.1% and 6.0%, respectively, P = 0.66). For both diarrhea and respiratory disease, there were no differences in morbidity between the Control and HBW groups (P > 0.05). The general mortality rate was higher in HBW (P = 0.01). Calves in the HBW group were eight times more likely to die when compared with those in the Control group (RR: 8; 95% CI: 1.03-61.6; P = 0.01), and 3.4 times more likely to present other diseases (omphalophlebitis, ruminal tympany, and bovine parasitic sadness; RR: 3.4; 95% CI: 1.3-8.5; P = 0.004) (Table 1).
ADG showed interaction (Group*time, P = 0.01), and on day 80, the ADG of the Control group was lower than that of the HBW group (1.12 ± 0.05 vs. 1.38 ± 0.05 kg, P < 0.05); furthermore, the effect of time (P < 0.001) was observed. As expected, the body weight was higher in the HBW group every time it was evaluated (P < 0.05). The body weight and thoracic perimeter showed interaction (Group*Time, P < 0.001), effect of group (P < 0.001) and time (P < 0.001). The HBW group showed a higher weight and greater thoracic perimeter than the Control group every time they were evaluated (P < 0.05) (Figure 1).
Average weight (A), average daily gain (B), thoracic perimeter (C), withers height (D) and width of the croup (E) from birth to 60 or 80 days of age in Girolando calves conceived through in vitro fertilization and born with weight of 35 kg or less (Control) or with more than 35 kg (HBW). *Moments when there was a significant difference (P < 0.05).
The mean concentrations of total protein, albumin, globulins, AST, ALT, ALP, GGT, cholesterol, triglycerides, urea, and PON1, were not different between the HBW and Control groups during the evaluated period (P > 0.05, Table 2).
DISCUSSION:
We investigated the hypothesis that IVF calves born with greater body weight were more susceptible to developing diseases. Surprisingly, there were no differences in the occurrence of diarrhea and respiratory disease. However, although, there is no chance of a higher incidence of illness, calves born with a birth weight greater than 35 kg were more likely to die.
The relationship between the calves’ birth weight and survival, and the incidence of disease and zootechnical performance have been evaluated in a few studies. There is evidence that high birth weight is associated with perinatal mortality in calves (JOHANSON & BERGER, 2003), with a great economic impact (MEYER et al., 2001). Very heavy calves at birth can predispose cows to various degrees of dystocia; consequently, leading to other perinatal changes such as neonatal asphyxia, reduced immunoglobulin absorption, and increased susceptibility to diseases (JACOBSEN et al., 2000). IVF may be linked to the birth of heavier calves, and also may be associated with an increase in mortality (CAMARGO et al., 2010; BONILLA et al., 2014) corroborating the obtained results; although, we did not observe a high rate of FPTI.
According to BLOCK et al. (2003), 18% of calves born following embryo transfer using in vitro production were born dead or died within 24 hours of birth. Other studies have also reported increased incidence of stillbirths and neonatal mortality, ranging from 7.8% to 22.2% in calves obtained via IVF (KRUIP & DEN DAAS, 1997; NUMABE et al., 2000; VAN WAGTENDONK-DE LEEUW et al., 2000; BONILLA et al., 2014), which is in accordance with the 9% reported in this experiment. However, results demonstrated that not only IVF, but the birth weight of the calves produced by IVF can influence mortality. In this study, calves that were born with bodyweight > 35 kg had a higher mortality rate and were eight times more likely to die when compared to control calves. Despite this, there were no differences in the occurrence of diarrhea and respiratory disease between the Control and HBW groups, but there were a greater number of cases of other diseases, such as, omphalophlebitis, tympany, and bovine parasitic sadness. Between these diseases, the omphalophlebitis can be caused by structural changes in the navel, which are reported in individuals obtained through IVF (LARCHER et al., 2023), facilitating the entry of pathogens into the blood circulation and thus contributing to high mortality. Also, tympany may be associated with failure of the reticular groove reflex in very large calves with a low sucking reflex (BIRGEL JUNIOR, et al., 2011), as well as, macroglossia (enlarged tongue) which is a characteristic of LOS (CHEN et al., 2013), causes feeding difficulties, and thus contributing to mortality. Still, anaemia and other blood- and plasma-related conditions (erythrocyte and haemoglobin decrease), which are observed in calves obtained by reproductive biotechniques (MEIRELLES et al., 2009), may have contributed to the high morbidity due to bovine parasitic sadness and deaths.
It is known that satisfactory ingestion of high-quality colostrum is essential to protect neonates against pathogens during their first weeks of life (CHASE et al., 2008), as it increases the mechanisms of defense in the neonate (CORTESE, 2009). In this study, there was no difference between groups in the percentage of animals that presented with FPIT, therefore, the highest number of deaths in heavy calves cannot be credited to this. Over the 80 days of the study, we found a diarrhea morbidity of 77%, very similar to those 77.9% reported by WEILLER et al. (2020). The results are within the expected for the Brazilian reality (53.6-100%) (LANGONI et al., 2004).
Despite the high weight-related mortality, those animals that do not die perform better, as seen by greater weight gain, thoracic perimeter, and height. Directly related to puberty, age at first calving, and the higher productivity of the future cow, the females bovine growth is an important characteristic within the farm system (SHIVLEY et al., 2018). The relationship between birth weight and animal performance has been assessed in some studies. YAYLAK et al. (2015), using Holstein animals, demonstrated that the weaning weight was directly influenced by the animals’ birth weight. In this context, animals that were born heavier also remained heavier for at least the first 15 life months (SWALI & WATHES, 2006). This was also observed in our study, where calves that were born heavier remained heavier throughout all assessments, as also those that were born taller, remained taller all times. Calves in this study had a medium birth weight greater than the one found by ALASSANE et al. (2018), in a study conducted in Africa, in which the birth weight of the Girolando females was 25.96 ± 0.70 kg, and heavier than 29.57 ± 4.4 kg, reported by OLIVEIRA & NOGUEIRA (2006), in Girolando calves. However, in this study, the authors did not specify the degree of blood Holstein-Gir.
FEUER et al. (2016) demonstrated that conception by IVF can reprogram metabolic homeostasis through metabolic, transcriptional, and epigenetic mechanisms, with lasting effects on adult growth. The reasons for the differences in mortality need to be clarified, as our study found no changes in different biochemical parameters between the two groups.
CONCLUSION:
The results obtained in the current research allow us to conclude that Girolando calves from IVF that born heavier have a greater chance of the present diseases, such as, omphalophlebitis, tympany, and bovine parasitic sadness, and a higher general mortality rate. However, birth weight does not influence diarrhea or pneumonia, morbidity or mortality, the zootechnical performance, or metabolism of the animals.
ACKNOWLEDGMENTS
The authors acknowledge the Conselho Nacional de Desenvolvimento Tecnológico e Científico (CNPq) for granting scholarships; the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) ; Finance code 001, the CNPq, and the Fundação de Amparo à Pesquisa do Estado do Rio Grande do Sul (FAPERGS) for funding the research; the Instituto Federal de Ciência e Tecnologia do Rio Grande do Sul for granting the first author a professional qualification leave; and the Universidade Federal de Pelotas (UFPel).
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BIOETHICS AND BIOSECURITY COMMITTEE APPROVAL
Edited by
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Editors: Rudi Weiblen (0000-0002-1737-9817) Gustavo Desire Antunes Gastal (0000-0002-5317-2207)
Publication Dates
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Publication in this collection
22 Jan 2024 -
Date of issue
July 2024
History
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Received
09 Nov 2022 -
Accepted
13 Oct 2023 -
Reviewed
07 Dec 2023
