Productive, biochemical, behavioral, and feeding parameters of Holstein cows treated with two formulations of recombinant bovine somatotropin

Araújo, Maria Carolina Narval de; Teixeira, Ritieli dos Santos; Duarte, Letícia Alves Martins; Barbosa, Antônio Amaral; Del Pino, Francisco Augusto Burkert; Almeida, Rodrigo de; Corrêa, Marcio Nunes

doi:10.1590/1678-992X-2023-0097

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Animal Science and Pastures • Sci. agric. (Piracicaba, Braz.) 81 • 2024 • https://doi.org/10.1590/1678-992X-2023-0097 copy

Productive, biochemical, behavioral, and feeding parameters of Holstein cows treated with two formulations of recombinant bovine somatotropin

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

This work aimed to compare the efficiency of two commercial recombinant bovine somatotropin (rbST) formulations on productive, metabolic, behavioral, and feeding parameters of mid-lactation Holstein cows. Eighteen secondiparous cows were randomly assigned to two groups to be treated with injectable rbST (rbST-Fast, Boostin ^® , MSD Saúde Animal; and rbST-Slow, Lactotropin ^® , Agener União Saúde Animal). Cows were rbST-treated during five cycles of 14 days each, totaling 70 days. Blood samples were collected thrice in each cycle to assess metabolic markers. Daily, automatic feeders and individual monitoring collars measured behavior and feed intake. Milk samples were collected weekly to evaluate milk composition and somatic cell count. The rbST-Fast group had higher milk production ( p = 0.03) and tended to present greater feed intake ( p = 0.07). In addition, animals treated with rbST-Fast had higher ( p < 0.01) concentrations of non-esterified fatty acids (NEFA) and tended ( p = 0.09) to have lower serum glucose values. As for the variation in body weight, cows treated with rbST-Fast lost approximately three times more weight ( p < 0.01) than rbST-Slow cows. Regarding milk components, cows from the rbST-Fast group produced milk with a higher lactose content ( p = 0.05). In conclusion, rbST-Fast treated cows produced more milk, had higher feed intake, and showed a higher degree of lipid mobilization, demonstrated through the higher body weight loss and higher NEFA concentrations.

feed intake; growth hormone; milk production; non-esterified fatty acids

Item	Experimental diet
Ingredient, % of DM
Corn silage	49.33
Ryegrass haylage	7.18
Soybean meal	10.61
Corn grain ground	9.52
Soy hulls	8.79
Wheat bran	3.49
Expeller soybean meal ¹	2.83
Defatted rice bran	2.49
Sorghum grain, high-moisture	2.00
Rumen-inert fat ²	0.97
Limestone	1.20
Sodium bicarbonate	0.55
Urea	0.39
Salt	0.30
Mineral-vitamin premix ³	0.14
Magnesium oxide	0.078
Dicalcium phosphate	0.046
Mycotoxins’ adsorbent ⁴	0.046
Live yeast ⁵	0.046
Ionophore ⁶	0.007
Nutrients, % of DM
DM	52.55
NDF	36.97
peNDF, > 1.18 mm	21.29
ADF	20.14
CP	15.94
RDP	10.09
RUP	5.85
MP, g d ^–1	2,921
NFC	38.38
Starch	25.83
Fat	3.47

	Treatment		SEM	p -value
	rbST-Fast	rbST-Slow	SEM	Treatment	Day	Treatment × Day
NEFA	0.61	0.43	0.03	< 0.01	< 0.01	< 0.01
BHB	0.47	0.46	0.03	0.69	< 0.01	< 0.01
Glucose	59.99	62.34	0.86	0.09	< 0.01	0.07
Albumin	3.37	3.22	0.09	0.29	< 0.01	< 0.01

	Treatment		SEM	p -value
	rbST-Fast	rbST-Slow	SEM	Treatment	Day	Treatment × Day
Activity	209.3	172.7	18.0	0.17	< 0.01	0.77
Rest	527.6	576.3	22.4	0.14	< 0.01	< 0.01
Rumination	667.4	689.2	20.2	0.46	< 0.01	< 0.01

	Treatment		SEM	p -values
	rbST-Fast	rbST-Slow	SEM	Treatment	Cycle	Treatment × Cycle
BW, kg	687.10	704.75	5.14	0.05	< 0.01	0.63
BCS, unit	3.01	3.11	0.10	0.56	0.19	0.77
Change in BW	–20.67	–5.44	3.02	< 0.01	-	-
Change in BCS	–0.28	–0.22	0.04	0.30	-	-

	Treatment		SEM	p -values
	rbST-Fast	rbST-Slow	SEM	Treatment	Week	Treatment × Week
Fat	4.44	4.06	0.19	0.20	0.32	0.72
Protein	3.17	3.24	0.05	0.37	< 0.01	0.08
Lactose	4.50	4.37	0.04	0.05	< 0.01	0.16
Total Solids	13.06	12.58	0.23	0.18	0.07	0.69
Casein	2.51	2.58	0.04	0.22	< 0.01	0.44
MUN	12.39	12.38	0.45	0.99	< 0.01	0.99
SCS	3.45	4.37	0.63	0.33	0.95	0.39

Escola Superior de Agricultura "Luiz de Queiroz" USP/ESALQ - Scientia Agricola, Av. Pádua Dias, 11, 13418-900 Piracicaba SP Brazil, Phone: +55 19 3429-4401 / 3429-4486 - Piracicaba - SP - Brazil
E-mail: scientia@usp.br

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[1] * Corresponding author < mariacarolinanupeec@gmail.com >