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dc.contributor.authorZarazaga Garcés, Luis Ángel 
dc.contributor.authorGatica Jorquera, María Carolina
dc.contributor.authorRosa, Ignacio de la
dc.contributor.authorGuzmán Guerrero, José Luis
dc.identifier.citationZarazaga, L. A., Gatica, M. C., De La Rosa, I., & Guzmán, J. L. (2021). 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. Research in Veterinary Science, 139, 177–185.
dc.description.abstractThis work examined the effect of acute nutritional restriction or supplementation one week before male introduction on the reproductive performances of the “male effect” when using photostimulated or control males in goats. On 22 March, 84 anoestrous does were placed with photostimulated bucks or with bucks which had received no treatments. One week before male introduction, the females were provided with different nutritional regimes: Supplemented, restricted or control females. The non-esterified fatty acids (NEFAs) and Insulin Growth Factor-1 (IGF-1) concentrations were measured in the same samples. Fecundity, fertility, prolificacy and productivity were also determined. No interaction between both sources of variation was observed in any of the reproductive variables studied. Treatment of the bucks increased the percentage of females expressing behavioural oestrous associated with ovulation (71% vs 90% for Natural and Photo groups, respectively, P < 0.05). The Supplemented females showed higher ovulation rate than Restricted females (1.77 ± 0.13 vs 1.05 ± 0.05, P < 0.001), fecundity (71% vs 43%, P < 0.05); fertility (76% vs 29%, P < 0.05) and productivity (1.00 ± 0.15 vs 0.29 ± 0.11 kids per female, P < 0.01). In the Supplemented females, the higher reproductive results could be due to the lower NEFAs and higher IGF-1 concentrations at ovulation and at the time of oestrus compared to the Restricted females. Thus, the present experiment results demonstrate that nutrition is an important factor in the response to the “male effect” at Mediterranean latitudes, and its negative effect cannot be counterbalanced by using photostimulated bucks.es_ES
dc.description.sponsorshipThis study was funded by Grant AGL2016-75848-R from MINECO- AEI-FEDER (Spain).
dc.description.sponsorshipThe authors wish to thank the farm staff of Huelva University for their technical support. Funding for open access charge: Universidad de Huelva/CBUA.
dc.relation.isversionofPublisher’s versión
dc.rightsAtribución-NoComercial-SinDerivadas 3.0 España*
dc.subject.otherMale effectes_ES
dc.titleThe 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 goatses_ES
dc.subject.unesco31 Ciencias Agrariases_ES

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