Social rank and response to the "male effect" in the Australian Cashmere goat

L. Alvarez, L. Zarco, F. Galindo, Dominique Blache, Graeme Martin

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

The present study was conducted to determine if the social status of Australian Cashmere goats affects their response to the male effect in terms of LH secretion, ovulation and expression of estrus. Australian Cashmere goats were kept isolated from the males during 5 months. The index of success (SI) of each goat was calculated to establish their social rank. In the first experiment, the ten most dominant and the 10 most subordinate goats were separated from the original herd and housed in two pens (5 dominant and 5 subordinate animals in each pen). An androgenized wether was then introduced into each pen. Luteinizing hormone (LH) was measured every 20 min from 2 h before to 4 h after introduction of the male in the goats of first pen and from 4 to 8 h after male introduction in the second pen. In the second experiment, the remaining 50 goats were exposed in their original pen to two androgenized wethers. Their association index with the males (AI) was calculated for each of these 50 goats, and the intervals from exposure to the males to the onset of estrus and to ovulation were determined. During the first 4 h after male introduction, the dominant goats had more LH pulses (0.65 +/- 0.06 compared with 0.3 +/- 0.09; P < 0.0.5) and greater LH mean concentrations (1.79 +/- 0.14 ng/ml compared with 1.30 +/- 0.15 ng/ml, P = 0.05) than the subordinate animals. Although not significantly different, the AI was 35% greater for high and medium ranking goats than for low ranking animals (0.031 +/- 0.004, 0.032 +/- 0.005 and 0.023 0.005, respectively, P > 0.05). Although the number of goats ovulating in response to male exposure was similar between dominance groups (high: 100%, medium: 94% and low ranking: 92%), the high and medium dominance goats showed a greater incidence of expression of estrus than low-dominance goats (94.4%, 89.5% and 53.8%, respectively, P < 0.05). It is concluded that the social rank of the Australian Cashmere goat influences their response to the male effect in terms of early LH secretion and expression of estrus. (C) 2006 Elsevier B.V. All rights reserved.
Original languageEnglish
Pages (from-to)258-266
JournalAnimal Reproduction Science
Volume102
Issue number3-4
DOIs
Publication statusPublished - 2007

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Cashmere (goat breed)
male effect
Goats
goats
Estrus
luteinizing hormone
Luteinizing Hormone
estrus
hormone secretion
Ovulation
ovulation
animal pens

Cite this

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title = "Social rank and response to the {"}male effect{"} in the Australian Cashmere goat",
abstract = "The present study was conducted to determine if the social status of Australian Cashmere goats affects their response to the male effect in terms of LH secretion, ovulation and expression of estrus. Australian Cashmere goats were kept isolated from the males during 5 months. The index of success (SI) of each goat was calculated to establish their social rank. In the first experiment, the ten most dominant and the 10 most subordinate goats were separated from the original herd and housed in two pens (5 dominant and 5 subordinate animals in each pen). An androgenized wether was then introduced into each pen. Luteinizing hormone (LH) was measured every 20 min from 2 h before to 4 h after introduction of the male in the goats of first pen and from 4 to 8 h after male introduction in the second pen. In the second experiment, the remaining 50 goats were exposed in their original pen to two androgenized wethers. Their association index with the males (AI) was calculated for each of these 50 goats, and the intervals from exposure to the males to the onset of estrus and to ovulation were determined. During the first 4 h after male introduction, the dominant goats had more LH pulses (0.65 +/- 0.06 compared with 0.3 +/- 0.09; P < 0.0.5) and greater LH mean concentrations (1.79 +/- 0.14 ng/ml compared with 1.30 +/- 0.15 ng/ml, P = 0.05) than the subordinate animals. Although not significantly different, the AI was 35{\%} greater for high and medium ranking goats than for low ranking animals (0.031 +/- 0.004, 0.032 +/- 0.005 and 0.023 0.005, respectively, P > 0.05). Although the number of goats ovulating in response to male exposure was similar between dominance groups (high: 100{\%}, medium: 94{\%} and low ranking: 92{\%}), the high and medium dominance goats showed a greater incidence of expression of estrus than low-dominance goats (94.4{\%}, 89.5{\%} and 53.8{\%}, respectively, P < 0.05). It is concluded that the social rank of the Australian Cashmere goat influences their response to the male effect in terms of early LH secretion and expression of estrus. (C) 2006 Elsevier B.V. All rights reserved.",
author = "L. Alvarez and L. Zarco and F. Galindo and Dominique Blache and Graeme Martin",
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Social rank and response to the "male effect" in the Australian Cashmere goat. / Alvarez, L.; Zarco, L.; Galindo, F.; Blache, Dominique; Martin, Graeme.

In: Animal Reproduction Science, Vol. 102, No. 3-4, 2007, p. 258-266.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Social rank and response to the "male effect" in the Australian Cashmere goat

AU - Alvarez, L.

AU - Zarco, L.

AU - Galindo, F.

AU - Blache, Dominique

AU - Martin, Graeme

PY - 2007

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N2 - The present study was conducted to determine if the social status of Australian Cashmere goats affects their response to the male effect in terms of LH secretion, ovulation and expression of estrus. Australian Cashmere goats were kept isolated from the males during 5 months. The index of success (SI) of each goat was calculated to establish their social rank. In the first experiment, the ten most dominant and the 10 most subordinate goats were separated from the original herd and housed in two pens (5 dominant and 5 subordinate animals in each pen). An androgenized wether was then introduced into each pen. Luteinizing hormone (LH) was measured every 20 min from 2 h before to 4 h after introduction of the male in the goats of first pen and from 4 to 8 h after male introduction in the second pen. In the second experiment, the remaining 50 goats were exposed in their original pen to two androgenized wethers. Their association index with the males (AI) was calculated for each of these 50 goats, and the intervals from exposure to the males to the onset of estrus and to ovulation were determined. During the first 4 h after male introduction, the dominant goats had more LH pulses (0.65 +/- 0.06 compared with 0.3 +/- 0.09; P < 0.0.5) and greater LH mean concentrations (1.79 +/- 0.14 ng/ml compared with 1.30 +/- 0.15 ng/ml, P = 0.05) than the subordinate animals. Although not significantly different, the AI was 35% greater for high and medium ranking goats than for low ranking animals (0.031 +/- 0.004, 0.032 +/- 0.005 and 0.023 0.005, respectively, P > 0.05). Although the number of goats ovulating in response to male exposure was similar between dominance groups (high: 100%, medium: 94% and low ranking: 92%), the high and medium dominance goats showed a greater incidence of expression of estrus than low-dominance goats (94.4%, 89.5% and 53.8%, respectively, P < 0.05). It is concluded that the social rank of the Australian Cashmere goat influences their response to the male effect in terms of early LH secretion and expression of estrus. (C) 2006 Elsevier B.V. All rights reserved.

AB - The present study was conducted to determine if the social status of Australian Cashmere goats affects their response to the male effect in terms of LH secretion, ovulation and expression of estrus. Australian Cashmere goats were kept isolated from the males during 5 months. The index of success (SI) of each goat was calculated to establish their social rank. In the first experiment, the ten most dominant and the 10 most subordinate goats were separated from the original herd and housed in two pens (5 dominant and 5 subordinate animals in each pen). An androgenized wether was then introduced into each pen. Luteinizing hormone (LH) was measured every 20 min from 2 h before to 4 h after introduction of the male in the goats of first pen and from 4 to 8 h after male introduction in the second pen. In the second experiment, the remaining 50 goats were exposed in their original pen to two androgenized wethers. Their association index with the males (AI) was calculated for each of these 50 goats, and the intervals from exposure to the males to the onset of estrus and to ovulation were determined. During the first 4 h after male introduction, the dominant goats had more LH pulses (0.65 +/- 0.06 compared with 0.3 +/- 0.09; P < 0.0.5) and greater LH mean concentrations (1.79 +/- 0.14 ng/ml compared with 1.30 +/- 0.15 ng/ml, P = 0.05) than the subordinate animals. Although not significantly different, the AI was 35% greater for high and medium ranking goats than for low ranking animals (0.031 +/- 0.004, 0.032 +/- 0.005 and 0.023 0.005, respectively, P > 0.05). Although the number of goats ovulating in response to male exposure was similar between dominance groups (high: 100%, medium: 94% and low ranking: 92%), the high and medium dominance goats showed a greater incidence of expression of estrus than low-dominance goats (94.4%, 89.5% and 53.8%, respectively, P < 0.05). It is concluded that the social rank of the Australian Cashmere goat influences their response to the male effect in terms of early LH secretion and expression of estrus. (C) 2006 Elsevier B.V. All rights reserved.

U2 - 10.1016/j.anireprosci.2006.11.002

DO - 10.1016/j.anireprosci.2006.11.002

M3 - Article

VL - 102

SP - 258

EP - 266

JO - Animal Reproduction Science

JF - Animal Reproduction Science

SN - 0378-4320

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