The use of photoperiod-treated bucks to induce a “male effect” does not compensate for the negative effects of nutritional restriction of the females in Mediterranean goats

Zarazaga, L.A.; Gatica, M.C.; Rosa, Ignacio de la; Guzmán, José Luis

doi:10.1016/j.rvsc.2021.07.027

Cited by 1 publication

(2 citation statements)

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“…The negative effect of nutritional management disorders on reproductive indices has recently been demonstrated in dairy goats during the non-breeding season (Espinoza- Flores et al, 2020;Zarazaga, Gatica, De La Rosa & Guzmán, 2021). Supporting this hypothesis,…”

Section: Discussionmentioning

confidence: 77%

“…In this sense, considering that an increase in premature embryonic loss may occur when nutritional requirements are not met (Kelly et al., 2005; Lea et al., 2006), this may explain the low pregnancy rates obtained in this experiment. The negative effect of nutritional management disorders on reproductive indices has recently been demonstrated in dairy goats during the non‐breeding season (Espinoza‐Flores et al., 2020; Zarazaga, Gatica, De La Rosa & Guzmán, 2021). Supporting this hypothesis, Figure 2 shows that from D103 to D116, there is a decrease in the CL frequency, adding to the fact that for G1, 97% of CL presented blood flow at D116, while for G2, only 67% presented.…”

Section: Discussionmentioning

confidence: 99%

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The male effect associated with prostaglandins and reproductive outcomes in photo‐stimulated Saanen goats during the non‐breeding season

Cosentino,

Balaro,

Leal

et al. 2024

Reprod Domestic Animals

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The efficiency of combining oestrous induction via a light program (16 h of light and 8 h of darkness for 60 days, ending on Day 0 – D0) with cloprostenol administration, followed by the male effect or not, was tested in acyclic Saanen goats during the non‐breeding season (June/2019 to January/2020). Initially, all animals (males and females) were submitted to the described light program; 60 days after its ending (D60), the females were divided into two groups, with (G1; n = 67) or without (G2; n = 61) a male effect from D60 to D75 after the light program. At D75, both groups received two cloprostenol doses (120 μg; intramuscular) 7.5 days apart (D75 and D82.5). Artificial insemination was performed at a specific time according to the oestrous onset (approximately 68.4 ± 1.2 h between the second cloprostenol dose and IA). Ultrasound scans were performed at different intervals to evaluate follicular dynamics and confirm pregnancy. At the first cloprostenol dose (D75), the proportion of does with at least a corpus luteum (CL), which indicates resumed cyclicity, was greater in G1 than in G2 (85.2% vs. 48.8%; p < .05), although no difference was found at the second dose (p > .05). The adjusted pregnancy rates (number of pregnant goats/oestrous goats) differed between G1 and G2 (21.7% vs. 42.0%; p < .05). G1 also showed a higher frequency of functional CL (based on blood flow and morphology) compared to G2 (96.9% vs. 66.7%; p < .05) at D116. A male effect using photo‐stimulated bucks after the first cloprostenol dose increased the number of does presenting CL after buck removal, and no impairment in the pregnancy rates of multiparous does was found.

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Section: Discussionmentioning

confidence: 77%