Variations De Durée De l'ANŒSTRUS De Lactation Chez Les Brebis De Race Ile-De-France

Mauléon, P.; Dauzier, L; Cornu, C

doi:10.1051/rnd:19650109

Cited by 66 publications

(42 citation statements)

References 1 publication

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“…The males were kept in with the females during at least 1 h for each experimental group. Females standing at mounting by the male were considered in oestrus (Maulé on and Dauzier, 1965). Ovulation rate was evaluated by laparoscopy 7 days after positive identification of oestrus.…”

Section: Managementmentioning

confidence: 99%

Nutrition level and season of birth do not modify puberty of Payoya goat kids

Zarazaga

Guzmán

Domínguez

et al. 2009

Animal

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This study analysed the effect of level of nutrition and date of birth (age) on the onset of puberty in Payoya she-kids born in autumn (November) or in winter (February). Two experiments were conducted to examine pubertal events at the onset of puberty. For each date of birth (age), two experimental groups were used, differing on the level of nutrition. Groups were balanced for live weight (LW) and body condition score (BCS). For the first experiment (goat kids born in autumn), 27 Payoya she-kids were used: high-nutrition group (H1, n513) and control group (C1, n514). For the second experiment (goat kids born in winter), 25 Payoya she-kids were used: high-nutrition group (H2, n513) and control group (C2, n512). In both experiments, the level of feeding was adjusted weekly according to LW so that the animals would gain about 50 and 100 g per day for C and H groups, respectively. Oestrus was tested daily using young aproned bucks. Ovulation rate was assessed by laparoscopy 7 days after identification of oestrus. Plasma samples were obtained weekly for progesterone assay. LW and BCS were recorded weekly. No effect of nutrition level or birth date (Experiment 1 v. 2) on the date of the first ovarian activity or the first detected oestrus was observed. No effect of nutrition on LW or BCS at the first detected oestrus was observed. Birth date influenced significantly the LW of the animals at the onset of ovarian activity or first oestrus (P,0.001). Irregular sexual activity was frequently observed before the first oestrus (74.7% and 48.0% of the first reproductive activity was irregular for Experiments 1 and 2, respectively). No effect of nutrition level or birth date on ovulation rate was observed. Ovulation rate at first oestrus was influenced by LW in November-born goat kids (1.0660.06 v. 1.6760.21 corpora lutea for LW,30 and >30 kg, respectively, P,0.01). These results demonstrate that the age at puberty was very dependent upon the season of birth in Payoya goat kids, and that there could be some benefit in breeding November-born goat kids at a higher LW to obtain a higher prolificacy at the first kidding as a consequence of a higher ovulation rate at puberty

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Section: Managementmentioning

confidence: 99%

Nutrition level and season of birth do not modify puberty of Payoya goat kids

Zarazaga

Guzmán

Domínguez

et al. 2009

Animal

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“…I), at the onset of the anestrous period, which extends from March to August [7]. On day 0, one male was introduced into each pen at 0800 h. Bucks remained with the goats for 15 consecutive days, and were exchanged between pens every 24 h. Estrus behavior was checked twice daily between 0800 h and 1000 h and between 1700 h and 1900 h, from day 0 to day 15 after introduction of the males [12] by focal observation of the behavior of the bucks. A female was recorded in estrus if she stood immobile when mounted by the buck.…”

Section: Animalsmentioning

confidence: 99%

Positive correlation between the body weight of anestrous goats and their response to the male effect with sexually active bucks

et al. 2006

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-In the present study, we analyzed the results of two years of response to the male effect in seasonally anestrous goats to investigate whether the activation of female reproductive activity by the male effect is related to the body weight of the females. Seventy-nine adult female Mexican mixed breed goats were used. The anestrous females were exposed during 15 days to sexually active males, and were classified into three categories according to their mean body weight ±SD (42 ± 9 kg) (Light: ≤ 33 kg, n = 19; Medium: 34-50 kg, n = 46; Heavy: ≥ 51 kg, n = 14). More than 98% of the goats from the Medium and Heavy groups showed at least one estrus behavior within the first 15 days following the introduction of the bucks, versus only 63% of the females from the Light group (P < 0.01). The interval between the introduction of the males and the onset of estrus behavior was longer in the females of the Light and Medium groups (4.2 ± 0.8 and 3.3 ± 0.3 days) than in the females of the Heavy group (2.0 ± 0.2 days; P < 0.03). Also, body weight was negatively correlated with latency to first estrus (Spearman r = −0.57; P < 0.001). These results are in agreement with the hypothesis that the ability of anestrous goats to respond to the male effect is positively influenced by their body weight. seasonality / live weight / estrus induction / teasing / body condition / biostimulation / subtropics

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“…In domestic ruminants, there is also some effect of the young on postpartum anoestrus duration (PPA), although the effect of nursing can only be evidenced during the reproductive season in species that show seasonal breeding [2,5]. For example, in sheep there is a positive correlation between nursing activity and PPA duration [6], and ewes and goats separated early from their young and submitted to milking, return to heat sooner than mothers that keep nursing [5,7], an effect partly due in sheep to an inhibitory action of PRL [8].…”

Section: Introductionmentioning

confidence: 99%

Prepartum peripherally-induced hyposmia does not reduce postpartum anoestrus duration in nursing goats

et al. 2004

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-Parturient goats rapidly develop exclusive nursing of their own litter that relies on olfactory recognition of the young. They also show a period of postpartum anoestrus whose duration depends on the presence of the kid. In cattle, maternal selectivity is one of the factors that delays the recovery of sexual activity. To investigate the possible influence of maternal selectivity on the duration of postpartum anoestrus in goats, we compared the recovery of estrus behavior by daily estrus detection with an active buck in intact and selective nursing goats (n = 24) with that of dams rendered non-selective by peripheral hyposmia with ZnSO 4 (n = 18). Postpartum anoestrus duration was shorter in intact (68 ± 7 days) than in hyposmic mothers (93 ± 7 days; P < 0.05). However, the cycles of normal duration were less frequent in intact goats (P = 0.03). We conclude that in nursing goats, preventing the establishment of selective nursing by prepartum peripheral hyposmia does not reduce postpartum anoestrus duration. Our results suggest that daily exposure to the buck may result in an earlier recovery of ovarian activity in intact mothers. postpartum anoestrus / anosmia / goat / maternal behavior / olfaction / selective bond

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Variations De Durée De l'ANŒSTRUS De Lactation Chez Les Brebis De Race Ile-De-France

Cited by 66 publications

References 1 publication

Nutrition level and season of birth do not modify puberty of Payoya goat kids

Nutrition level and season of birth do not modify puberty of Payoya goat kids

Positive correlation between the body weight of anestrous goats and their response to the male effect with sexually active bucks

Prepartum peripherally-induced hyposmia does not reduce postpartum anoestrus duration in nursing goats

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