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Pattern of follicular growth and ovulation frequency in post-partum beef cows after a temporal calf removal associated with a gonadotrophin release hormone

Published online by Cambridge University Press:  20 November 2017

G. Quintans  and
C. Viñoles
G. Quintans
Affiliation:
National Institute of Agricultural Research, 33000, Ruta 8 km 281, Treinta y Tres, Uruguay
C. Viñoles
Affiliation:
National Institute of Agricultural Research, 33000, Ruta 8 km 281, Treinta y Tres, Uruguay
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Extract

The main cause of prolonged post-partum anoestrous in suckled cows is the failure of dominant follicles to ovulate. Increased LH pulse frequency is necessary to promote dominant follicles (DF) to ovulate. A 96 h period of calf removal lead to a 2-fold increase in the LH pulse frequency in the study of Stagg et al. (1998). Moreover, acute calf isolation and once-a-day suckling shortly after the emergence of the fourth follicular wave induced two thirds of cows to ovulate the ΔF of that wave (Sinclair et al., 1999). The present study was carried out to investigate the effect of 96 h calf removal and GnRH administration on the duration of the post-partum anoestrous period in suckled beef cows.

Type
Poster Presentations
Information
Proceedings of the British Society of Animal Science , Volume 2002 , 2002 , pp. 127
Copyright
Copyright © The British Society of Animal Science 2002

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References

Earle, D. 1976. A guide to scoring dairy cow condition. J. Agric. Farmers Victoria 74:228–230 Google Scholar
Sinclair, K.D., Molle, G., Revilla, R., Roche, J.F., Quintans, G., San Juan, L., Sanz, A., Mackey, D.R. and Diskin, M.G. 1999. Effects of body condition at calving, post-partum nutrition and calf access on the interval from calving to first ovulation in beef cows: cow performance and metabolism. Proccedings of the Annual BSAS Meeting (abstract 004).Google Scholar
Stagg, K., Spicer, L.J., Sreenan, J.M., Roche, J. F. and Diskin, M.G.. 1998 Effect of calf isolation on follicular wave dynamics, gonadotropin and metabolic hormones cahnes, and interval to first ovulation in beef cows fed either of two energy level postpartum. Biology of Reproduction 59: 777–783 Google Scholar