Influence of nutritional and socio-sexual cues upon reproductive efficiency of goats exposed to the male effect under extensive conditions
M. J. Flores-Najera A E , C. A. Meza-Herrera B , F. G. Echavarría A , E. Villagomez A , L. Iñiguez C , H. Salinas A and A. Gonzalez-Bulnes DA Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias, Calera, Zacatecas 98500, Mexico.
B Universidad Autónoma Chapingo, Unidad Regional Universitaria de Zonas Áridas, Bermejillo, Durango 35230, México.
C International Centre for Agricultural Research in Dry Areas, PO Box 5466, Aleppo, Syria.
D Departamento de Reproducción, INIA, Madrid 28040, Spain.
E Corresponding author. Email: flores.manuel@inifap.gob.mx
Animal Production Science 50(9) 897-901 https://doi.org/10.1071/AN10030
Submitted: 16 February 2010 Accepted: 3 July 2010 Published: 29 September 2010
Abstract
This study evaluated the effect of nutritional supplementation and socio-sexual cues upon reproductive efficiency of goats exposed to the male effect under rangeland grazing conditions (22°N). Criollo goats (n = 73) were distributed in four experimental groups: (1) continuous males (CM, n = 19) in which males (n = 2) remained together with females from 7 March to 28 July; (2) supplemented males (SM, n = 16) in which males (n = 2) were kept separately and were individually supplemented with 18% crude protein and 2.77 Mcal ME kg–1 DM, during a 30-day period; (3) supplemented males exposed to the female effect (SM + FE, n = 19), in which supplemented males (n = 2) were maintained with females induced to oestrus before being used for male effect; and (4) supplemented males and supplemented females (SM + SF, n = 19) in which males (n = 2) were supplemented as in group SM, and females received the same supplementation as males 30 days before and 30 days after male introduction. Grazing was performed from 0900 to 1900 hours; liveweight (LW) was registered weekly before grazing and (or) supplementation. Ovarian activity was evaluated (serum P4 concentrations) in the four groups before and after male introduction. At the beginning of the study and supplementation, female LW did not differ among treatments (P > 0.01). However, during the supplementation phase, LW increased in a different fashion among groups (P < 0.002), favouring the SM, SM + FE and SM + SF groups. A positive correlation between female LW at the beginning of the rainy season and the onset of ovulatory activity was observed (r = +0.90; P < 0.01). The average date for the onset of ovarian activity differed (P < 0.001) among groups, being earlier in the SM + SF group (9 May ± 4.3 days), which also depicted the shortest interval between the introduction of males until the onset of ovulatory activity (P < 0.001). Results of the present study indicate that nutritional signalling of the reproductive activity of both female and male Criollo goats reared under marginal conditions surmounts the inhibitory effects of long-day photoperiods during the non-reproductive season. An increased level of nutrition during the anestrous season may be used to increase reproductive function of both male and female goats reared in harsh nutritional conditions and applied as a green, clean, and ethical reproductive tool at these latitudes.
Acknowledgements
The authors acknowledge partial financial support of the International Collaborative Projects CONACYT-FOMIX-DURANGO: DGO-2008-C01-87559 and DGO-2009-C02-116746, funded by CONACYT, Mexico, as well as ALFA-III-ALAS, DCI-ALA/A9.09.01/08/19189/161-358/ALFA-III-82, supported by the European Union.
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