Lactational response of Jersey cows to bovine somatotropin administered daily or in a sustained-release formulation

Twenty-four Jersey cows were administered either 0 or 15.5 mg of bST/d or 310 mg of bST/14 d to determine the effect on milk yield, milk composition, feed intake, and body weight. Administration of bST was from wk 14 through 42 postpartum. Cows were housed in a tie-stall barn and fed for ad libitum...

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Published inJournal of dairy science Vol. 75; no. 12; pp. 3402 - 3407
Main Authors Jenny, B.F. (Louisiana State University Agriculture Center, Baton Rouge), Grimes, L.W, Pardue, F.E, Rock, D.W, Patterson, D.L
Format Journal Article
LanguageEnglish
Published United States Am Dairy Sci Assoc 01.12.1992
American Dairy Science Association
Subjects
Animals
Body Weight - drug effects
Cattle - physiology
COMPOSICION QUIMICA
COMPOSITION CHIMIQUE
CONDICION CORPORAL
CONTENIDO DE MATERIA SECA
Delayed-Action Preparations
EFFICACITE ALIMENTAIRE
EFICIENCIA DE CONVERSION DEL PIENSO
ETAT CORPOREL
Female
Growth Hormone - administration & dosage
Growth Hormone - adverse effects
Growth Hormone - pharmacology
HORMONAS PITUITARIAS
HORMONE HYPOPHYSAIRE
INGESTION DE PIENSO
INJECTION
INYECCION
Lactation - drug effects
LAIT
LECHE
MAMMITE BOVINE
MASTITIS BOVINA
METHODE D'APPLICATION
METODOS DE APLICACION
PESO
POIDS
PRISE ALIMENTAIRE (ANIMAUX)
RENDEMENT LAITIER
RENDIMIENTO LECHERO
TENEUR EN MATIERE SECHE
VACAS LECHERAS
VACHE LAITIERE
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Summary:Twenty-four Jersey cows were administered either 0 or 15.5 mg of bST/d or 310 mg of bST/14 d to determine the effect on milk yield, milk composition, feed intake, and body weight. Administration of bST was from wk 14 through 42 postpartum. Cows were housed in a tie-stall barn and fed for ad libitum intake a TMR adjusted to one of two energy protein densities according to milk yield. Milk yield of cows administered bST daily or by sustained-release vehicle increased 27.6 and 24.7%, respectively, over that of control cows; FCM increased by 30.3 and 26.7%. Percentages of fat and protein in milk were unaffected by bST treatment. Dry matter intake of cows administered bST was greater than that of control cows, whether expressed as kilograms per day or as a percentage of body weight. Apparent efficiency of yield increased in cows administered bST. No significant change in body weight occurred; however, cows administered bST had lower body condition scores at 42 wk postpartum. This trial demonstrated comparable effects of bST on lactational performance when administered daily or in a 14-d sustained-release vehicle
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ISSN:0022-0302
1525-3198
DOI:10.3168/jds.S0022-0302(92)78116-8