The Effects of Daily Oxytocin Injections Before and After Milking on Milk Production, Milk Plasmin, and Milk Composition

Exogenous daily oxytocin injections given immediately before milking increase milk production. To investigate the mechanism by which oxytocin increases milk production, oxytocin injections were given before and after milking, and saline injection was given before milking as a control. The experiment...

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Bibliographic Details
Published in:Journal of dairy science 1993-06, Vol.76 (6), p.1544-1549
Main Authors: Ballou, Linda U., Bleck, Jeffrey L., Bleck, Gregory T., Bremel, Robert D.
Format: Article
Language:English
Subjects:
Animals
Biological and medical sciences
Cattle - physiology
COMPOSICION QUIMICA
COMPOSITION CHIMIQUE
Female
Fibrinolysin - metabolism
Food industries
Fundamental and applied biological sciences. Psychology
INJECTION
INYECCION
LACTACION
LACTATION
Lactation - drug effects
Lactation - physiology
LAIT
LECHE
Milk - chemistry
Milk - cytology
Milk - metabolism
Milk and cheese industries. Ice creams
milk plasmin
milk production
NUMERO DE LACTACION
NUMERO DE LACTATION
OCYTOCINE
OXITOCINA
oxytocin
Oxytocin - pharmacology
PLASMINA
PLASMINE
PRECURSEUR D'ENZYME
PRECURSORES DE ENZIMAS
RENDEMENT LAITIER
RENDIMIENTO LECHERO
VACAS LECHERAS
VACHE LAITIERE
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Summary:Exogenous daily oxytocin injections given immediately before milking increase milk production. To investigate the mechanism by which oxytocin increases milk production, oxytocin injections were given before and after milking, and saline injection was given before milking as a control. The experimental design was a replicated Latin square; two complete trials were performed: one with 12 cows (45 d) and another with 15 cows (95 d). In the first trial, the least squares means of milk production were 29.2, 29.3, and 28.3kg for oxytocin injection before milking, oxytocin injection after milking, and saline injection before milking, respectively. In the second trial, the least squares means of milk production were 33.3, 32.9, and 32.4kg for oxytocin injection before milking, oxytocin injection after milking, and saline injection before milking, respectively. Oxytocin before and after milking significantly increased milk production by 3%. The results suggest that increases in milk production may not be caused by removal of residual milk but by increased gland output of milk. The effect on milk plasmin activity, fat, protein, SCC, and lactose was nonsignificant and may indicate that effect of oxytocin is not manifested through an effect on cell remodeling.
ISSN:0022-0302
1525-3198
DOI:10.3168/jds.s0022-0302(93)77487-1