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Long days in winter or the presence of adult sexually active rams did not influence the timing of puberty of autumn-born Rasa Aragonesa ram-lambs

Abstract : Forty autumn-born ram-lambs were used to study the effect of several rearing strategies on their sexual activity and fertility at 8 months of age. The animals were assigned to one of the following four groups (n = 10): FA, which were exposed to 2 months of long days (15 January-15 March); SAR, which were housed with three Sexually Activated adult Rams from 15 March to 20 June; NAR, housed with three Nonactivated adult Rams, and Control (C), kept isolated from adult rams throughout the experiment. In mid-June, individual and group ram serving-capacity tests were performed. Mean plasma testosterone levels (ng/ml) throughout the experiment were higher (P < 0.001) in the C (4.4 +/- 0.2) and SAR (4.3 +/- 0.2) groups than in the FA (3.4 +/- 0.2) and NSA (3.4 +/- 0.2) groups. In the serving tests, control ram-lambs executed a higher total mean number of sexual events than the other groups (P < 0.05). Fertility rates of SAR- (90%) or C-mated ewes (100%) were higher (P < 0.01) than ewes mated by the FA (50%) and NAR (40%) ram-lambs. In conclusion, autumn-born ram-lambs reared in isolation from adult congeners had the highest sexual activity and fertility at 8 months of age, which suggests that no special rearing strategy is necessary to induce puberty in these rams.
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https://hal.inrae.fr/hal-03021263
Contributor : Agnès Girard <>
Submitted on : Tuesday, November 24, 2020 - 11:25:49 AM
Last modification on : Wednesday, May 19, 2021 - 10:37:50 AM

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José Alfonso Abecia, Marianne Gave, Ana I Garcia, Adriana Casao, Melissa Carvaja-Lserna, et al.. Long days in winter or the presence of adult sexually active rams did not influence the timing of puberty of autumn-born Rasa Aragonesa ram-lambs. Biological Rhythm Research, Taylor & Francis, 2019, ⟨10.1080/09291016.2019.1613321⟩. ⟨hal-03021263⟩

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