How to use recombinant bovine somatotropin in crossbred Holstein × Gyr (3/4 and 7/8) cows?

How to use recombinant bovine somatotropin in crossbred Holstein × Gyr (3/4 and 7/8) cows?

The aim of this study was to evaluate the effects of dose, start time, and application interval of recombinant bovine somatotropin (rbST) on performance, health, and reproduction parameters of crossbred Holstein × Gyr dairy cows (3/4 and 7/8). A 2 × 2 × 2 factorial study was designed to test the eff...

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Bibliographic Details
Published in:Tropical animal health and production Vol. 55; no. 2; p. 63
Main Authors: Campos, Betânia Glória, Lombardi, Mayara Campos, do Carmo Diniz Neto, Hilton, Lana, Ângela Maria Quintão, Pereira, Marcos Neves, Rabelo, Euler, Silper, Bruna Figueiredo, Machado, Tiatrizi Siqueira, Coelho, Sandra Gesteira
Format: Journal Article
Language:English
Published: Dordrecht Springer Netherlands 01-04-2023
Springer Nature B.V
Subjects:
Animals
Biomedical and Life Sciences
Cattle
Dairy cattle
Dairy Science and Health in the Tropics
Design analysis
Factorial design
Female
Growth Hormone - pharmacology
Growth hormones
Intervals
Lactation - physiology
Life Sciences
Milk
Milk production
Physical growth
Pregnancy
Regular Articles
Reproduction
Veterinary Medicine/Veterinary Science
Zoology
Lactation persistence
Milk composition
Productive performance
Dairy cattle
Milk yield
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Summary:The aim of this study was to evaluate the effects of dose, start time, and application interval of recombinant bovine somatotropin (rbST) on performance, health, and reproduction parameters of crossbred Holstein × Gyr dairy cows (3/4 and 7/8). A 2 × 2 × 2 factorial study was designed to test the effects of application dose (250 mg rbST or 500 mg rbST), start of application (40 or 63 days in milk (DIM)), and application interval (12 or 14 days); 180 crossbred Holstein × Gyr cows were enrolled. Treatments with 500 mg rbST resulted in increased milk production, 3.5% fat-corrected milk (FCM), and energy-corrected milk (ECM). In the factorial design analysis, greater FCM, ECM, and milk solid production (kg/day) were observed when 500 mg rbST was started at 63 DIM, while 250 mg rbST resulted in greater milk production (kg/day), FCM, ECM, and milk solids (kg/day) when administered at 12-day intervals. Administration of 500 mg rbST resulted in an increase of days open and number of services per pregnancy ( P  = 0.01). Holstein × Gyr cows (3/4 and 7/8) presented a superior productive response to rbST when treated with 500 mg starting at 63 DIM and at 14-day intervals.
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ISSN:0049-4747
1573-7438
DOI:10.1007/s11250-023-03489-4