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Effect of GnRH pulse infusion on LH profiles and ovarian follicle populations at 7 weeks post-partum in beef cows in different body conditions

Published online by Cambridge University Press:  24 November 2017

L. Pinto Andrade ,
S.M. Rhind ,
L.A. Wright ,
S.R. McMillen  and
T.K. Whyte
L. Pinto Andrade
Affiliation:
Macaulay Land Use Research Institute, Pentlandfield, Roslin, Midlothian EH25 9RF
S.M. Rhind
Affiliation:
Macaulay Land Use Research Institute, Pentlandfield, Roslin, Midlothian EH25 9RF
L.A. Wright
Affiliation:
Macaulay Land Use Research Institute, Pentlandfield, Roslin, Midlothian EH25 9RF
S.R. McMillen
Affiliation:
Macaulay Land Use Research Institute, Pentlandfield, Roslin, Midlothian EH25 9RF
T.K. Whyte
Affiliation:
Macaulay Land Use Research Institute, Pentlandfield, Roslin, Midlothian EH25 9RF
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Extract

Previous studies have indicated that low body condition (LBC) at calving increases the duration of the postpartum anoestrous period in suckling beef cows (Henricks et al 1986; Wright et al 1987). The results of recent experiments also suggest that animals in LBC have a reduced incidence of LH pulses (Wright et al 1990) which is associated with a reduction in the incidence of large, oestrogenic, potentially ovulatory ovarian follicles (Prado et al 1990).

An experiment was designed to determine a) whether or not the normal process of follicular development can be accelerated in LBC cows by infusion of pulses of GnRH, so that their postpartum anoestrous period was as short as that of cows in HBC and b) the effect of GnRH pulse infusions on associated gonadotropin profiles.

Type
Beef
Information
Proceedings of the British Society of Animal Production (1972) , Volume 1992 , March 1992 , pp. 196
Copyright
Copyright © The British Society of Animal Production 1992

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References

Henricks, D.M., Rome, T. D., Ferrel, C.L. and Echternkamp, S.E., 1986. A note on the effect of nutrition on ovulation and ovarian follicular populations in the individually fed postpartum beef heifer. Anim.Prod. 73: 557–560.Google Scholar
Prado, R., Rhind, S.M., Wright, I.A., Russel, A.J.F., McMiilen, S.R., Smith, A.J. and McNeilly, A.S., 1990. Ovarian follicle populations, steroidogenicity and micromorphology at 5 and 9 weeks postpartum in beef cows in two levels of body condition. Anim.Prod. 51: 103–108.Google Scholar
Wright, I.A., Rhind, S.M., Russel, A.J.F., Whyte, T.K., McBean, A.J. and McMillen, S.R., 1987. Effects of body condition, food intake and temporary calf separation on the duration of the postpartum anoestrous period and associated LH, FSH and prolactin concentrations in beef cows. Anim.Prod. 75; 395–402.Google Scholar
Wright, I.A., Rhind, S.M., Whyte, T.K., Smith, A.J., McMillen, S.R. and Prado, R., 1990. Circulating concentrations of LH and FSH and pituitary responsiveness to GnRH in intact and ovariectomized suckled beef cows in two levels of body condition. Anim.Prod. 51: 93–101.Google Scholar