Correlation between estrus onset and ovarian parameters in dairy goats

Cortat, Paula Renata; Dias, Mirela Balistrieri; Paula, Cleber Jonas Carvalho de; Rangel, Paulo Sergio Cerqueira; Oliveira, Maria Emilia Franco; Souza-Fabjan, Joanna Maria Gonçalves de; Fonseca, Jeferson Ferreira da

doi:10.1590/1809-6891v22e-70813E

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Veterinary Medicine • Ciênc. anim. bras. 23 • 2022 • https://doi.org/10.1590/1809-6891v22e-70813E copy

Correlation between estrus onset and ovarian parameters in dairy goats

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Abstract

This study assessed the effects of social dominance on the behavioral estrus and ovarian parameters of dairy goats subjected to synchronous estrus induction during the non-breeding season. Synchronous estrus was induced in 23 dairy goats allocated to collective pens. Ovarian ultrasonography was performed at 12 h intervals from device removal to ovulation. Upon estrus onset (EO) detection, the goats were immediately removed from the pens. Dominance was scored according to EO in relation to device removal in each pen, with HD - high dominants (<36 h; n = 8), MD - medium dominants (36 to 48 h; n = 10) and LD - low dominants (>48 h; n = 5). Goats in estrus underwent flexible time artificial insemination (FxTAI) according to EO. The estrus response was 100.0%. The interval to estrus was longer (P<0.05) in LD (53.7 ± 6.5 h) than in MD (37.9 ± 5.5 h) and HD goats (32.3 ± 6.6 h), while the interval from device removal to ovulation was similar (P>0.05) among all groups. The interval from EO to FxTAI was longer in HD goats compared to the other groups (P<0.05). In conclusion, although social hierarchy influenced the time of EO, the ovarian parameters, including ovulation, were not affected.

Keywords:
goats; estrus behavior; follicular dynamics; social hierarchy; ovulation

Parameters	Groups
Parameters	HD	MD	LD	P-values
Animal (n)	8	10	5	-
Follicular wave emergence time after device insertion (h)	78.0 ± 11.1	74.4 ± 21	72.0 ± 24	0.847
Follicular wave emergence time after device removal (h)	64.4 ± 10	70.4 ± 20.7	78.0 ± 7.8	0.322
Estrus response (%)	100.0 (8/8)	100.0 (10/10)	100.0 (5/5)	-
Interval from device insertion to estrus onset (h)	94.1 ± 5.7^a a ,	101.9 ± 3.4^b b Values with different superscripts differed among the groups (P < 0.05). HD (high dominant goats), MD (medium dominant goats) and LD (low dominant goats);	114.7 ± 6.1^b b Values with different superscripts differed among the groups (P < 0.05). HD (high dominant goats), MD (medium dominant goats) and LD (low dominant goats);	<0.001
Interval from device removal to estrus onset (h)	32.3 ± 6.6^a a ,	37.9 ± 5.5^a a ,	53.7 ± 6.5^b b Values with different superscripts differed among the groups (P < 0.05). HD (high dominant goats), MD (medium dominant goats) and LD (low dominant goats);	0.004
Interval from device insertion to ovulation (h)	129.8 ± 10.6	139.5 ± 20.3	140.8 ± 6.0	0.188
Interval from follicular wave emergence to ovulation (h)	132.3 ± 15.6	145.9 ± 40.5	157.8 ± 10.5	0.082
Interval from device removal to ovulation (h)	67.9 ± 11.0	75.5 ± 20.4	79.8 ± 7.1	0.380
Interval from estrus onset to ovulation (h)	35.6 ± 11.1	37.6 ± 20.7	26.1 ± 10.6	0.258
Diameter of the largest ovulatory follicle (mm)	8.2 ± 1.1	8.3 ± 1.4	8.1 ± 1.7	0.974
Diameter of the second-largest ovulatory follicle (mm)	7.8 ± 1.1	7.7 ± 1.2	8.1 ± 1.7	0.877
Average ovulatory follicle diameter (mm)	8.0 ± 1.0	8.0 ± 1.3	8.1 ± 1.7	0.991
Animals ovulating (%)	100.0 (8/8)	100.0 (10/10)	100.0 (5/5)	-
Number of ovulations	1.9 ± 0.6	1.9 ± 0.6	1.5 ± 0.6	0.483
Number corpora lutea on Day 7 after estrus onset	1.4 ± 0.5	1.4 ± 0.5	1.5 ± 0.6	0.970
Interval from device removal to artificial insemination (h)	60.7 ± 7.3^a a , ^b b Values with different superscripts differed among the groups (P < 0.05). HD (high dominant goats), MD (medium dominant goats) and LD (low dominant goats);	55.2 ± 5.5^a a ,	63.6 ± 5.7^b b Values with different superscripts differed among the groups (P < 0.05). HD (high dominant goats), MD (medium dominant goats) and LD (low dominant goats);	0.025
Interval from estrus onset to artificial insemination (h)	28.4 ± 6.4^b b Values with different superscripts differed among the groups (P < 0.05). HD (high dominant goats), MD (medium dominant goats) and LD (low dominant goats);	17.4 ± 0.1^a a ,	9.9 ± 7.0^a a ,	<0.001
Pregnancy (%)	71.4 (5/8)	20.0 (2/10)	60.0 (3/5)	-

Universidade Federal de Goiás Universidade Federal de Goiás, Escola de Veterinária e Zootecnia, Campus II, Caixa Postal 131, CEP: 74001-970, Tel.: (55 62) 3521-1568, Fax: (55 62) 3521-1566 - Goiânia - GO - Brazil
E-mail: revistacab@gmail.com

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[1] *Correspondent: paulacortat@id.uff.br