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Influence of lameness on follicular growth, ovulation, reproductive hormone concentrations and estrus behavior in dairy cows

The objective of this study was to examine the effect of a chronic stressor, lameness, on reproductive parameters. Seventy cows 30–80 days post-partum were scored for lameness and follicular phases synchronized with GnRH followed seven days later by prostaglandin (PG). Fifteen Lame animals did not r...

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Autores principales: Morris, M.J., Kaneko, K., Walker, S.L., Jones, D.N., Routly, J.E., Smith, R.F., Dobson, H.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Elsevier 2011
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3156299/
https://www.ncbi.nlm.nih.gov/pubmed/21601262
http://dx.doi.org/10.1016/j.theriogenology.2011.03.019
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author Morris, M.J.
Kaneko, K.
Walker, S.L.
Jones, D.N.
Routly, J.E.
Smith, R.F.
Dobson, H.
author_facet Morris, M.J.
Kaneko, K.
Walker, S.L.
Jones, D.N.
Routly, J.E.
Smith, R.F.
Dobson, H.
author_sort Morris, M.J.
collection PubMed
description The objective of this study was to examine the effect of a chronic stressor, lameness, on reproductive parameters. Seventy cows 30–80 days post-partum were scored for lameness and follicular phases synchronized with GnRH followed seven days later by prostaglandin (PG). Fifteen Lame animals did not respond to GnRH ovarian stimulation. Milk progesterone for 5 days prior to PG was lower in the remaining Lame cows than Healthy herdmates. Fewer Lame cows ovulated (26/37 versus 17/18; P = 0.04) and the interval from PG to ovulation was shorter in Lame cows. In Subset 1 (20 animals), the LH pulse frequency was similar in ovulating animals (Lame and Healthy) but lower in Lame non-ovulators. An LH surge always preceded ovulation but lameness did not affect the interval from PG to LH surge onset or LH surge concentrations. Before the LH surge, estradiol was lower in non-ovulating cows compared to those that ovulated and estradiol concentrations were positively correlated with LH pulse frequency. In Subset 2 (45 cows), Lame ovulating cows had a less intense estrus than Healthy cows, although Lame cows began estrus and stood-to-be-mounted earlier than Healthy cows. In conclusion, we have identified several parameters to explain poor fertility in some chronically stressed animals. From 30 to 80 days post-partum, there was a graded effect that ranged from 29% Lame cows with absence of ovarian activity, whereas another 21% Lame cows failed to express estrus or ovulate a low estrogenic follicle; in 50% cows, many reproductive parameters were unaffected by lameness.
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spelling pubmed-31562992011-10-03 Influence of lameness on follicular growth, ovulation, reproductive hormone concentrations and estrus behavior in dairy cows Morris, M.J. Kaneko, K. Walker, S.L. Jones, D.N. Routly, J.E. Smith, R.F. Dobson, H. Theriogenology Research Article The objective of this study was to examine the effect of a chronic stressor, lameness, on reproductive parameters. Seventy cows 30–80 days post-partum were scored for lameness and follicular phases synchronized with GnRH followed seven days later by prostaglandin (PG). Fifteen Lame animals did not respond to GnRH ovarian stimulation. Milk progesterone for 5 days prior to PG was lower in the remaining Lame cows than Healthy herdmates. Fewer Lame cows ovulated (26/37 versus 17/18; P = 0.04) and the interval from PG to ovulation was shorter in Lame cows. In Subset 1 (20 animals), the LH pulse frequency was similar in ovulating animals (Lame and Healthy) but lower in Lame non-ovulators. An LH surge always preceded ovulation but lameness did not affect the interval from PG to LH surge onset or LH surge concentrations. Before the LH surge, estradiol was lower in non-ovulating cows compared to those that ovulated and estradiol concentrations were positively correlated with LH pulse frequency. In Subset 2 (45 cows), Lame ovulating cows had a less intense estrus than Healthy cows, although Lame cows began estrus and stood-to-be-mounted earlier than Healthy cows. In conclusion, we have identified several parameters to explain poor fertility in some chronically stressed animals. From 30 to 80 days post-partum, there was a graded effect that ranged from 29% Lame cows with absence of ovarian activity, whereas another 21% Lame cows failed to express estrus or ovulate a low estrogenic follicle; in 50% cows, many reproductive parameters were unaffected by lameness. Elsevier 2011-09-01 /pmc/articles/PMC3156299/ /pubmed/21601262 http://dx.doi.org/10.1016/j.theriogenology.2011.03.019 Text en © 2011 Elsevier Inc. https://creativecommons.org/licenses/by/3.0/ Open Access under CC BY 3.0 (https://creativecommons.org/licenses/by/3.0/) license
spellingShingle Research Article
Morris, M.J.
Kaneko, K.
Walker, S.L.
Jones, D.N.
Routly, J.E.
Smith, R.F.
Dobson, H.
Influence of lameness on follicular growth, ovulation, reproductive hormone concentrations and estrus behavior in dairy cows
title Influence of lameness on follicular growth, ovulation, reproductive hormone concentrations and estrus behavior in dairy cows
title_full Influence of lameness on follicular growth, ovulation, reproductive hormone concentrations and estrus behavior in dairy cows
title_fullStr Influence of lameness on follicular growth, ovulation, reproductive hormone concentrations and estrus behavior in dairy cows
title_full_unstemmed Influence of lameness on follicular growth, ovulation, reproductive hormone concentrations and estrus behavior in dairy cows
title_short Influence of lameness on follicular growth, ovulation, reproductive hormone concentrations and estrus behavior in dairy cows
title_sort influence of lameness on follicular growth, ovulation, reproductive hormone concentrations and estrus behavior in dairy cows
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3156299/
https://www.ncbi.nlm.nih.gov/pubmed/21601262
http://dx.doi.org/10.1016/j.theriogenology.2011.03.019
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