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Effect of nutritional supplementation upon pregnancy rates of goats under semiarid rangelands and exposed to the male effect

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Abstract

The aim of this study was to evaluate possible effects of improved protein and energy diet upon reproductive outcomes of adult goats under marginal rangeland grazing conditions and exposed to the male effect during the anoestrous–dry season. Adult goats (Nubian × Criollo, nonpregnant, nonlactating, n = 160, 22° 50′ N, 100° 59′ W, 1,653 m) were randomly divided in two experimental groups: Control (CG; n = 80) and Supplemented (SG; n = 80). Both CG and SG goats were kept together during the day for ranging a semiarid rangeland while separated accordingly at night. SG goats were individually supplemented [400 g kg−1 day−1 ; 14% CP and 2.92 Mcal DE kg−1] during a 30-day period. Thereafter, both the CG [35.5 ± 0.94 kg LW, 1.95 ± 0.06 U, body condition score (BCS)] and the SG [39.5 ± 0.94 kg LW, 2.29 ± 0.06 BCS] were exposed to adult males (Nubian, n = 4, two per group) of proven libido and fertility and kept together at night (1700–0900) during a 42-day experimental breeding period. At the beginning of the breeding period, both LW (P < 0.001) and BCS (P < 0.001) were higher in the SG, which was also reflected in higher pregnancy rate (92.5 vs. 76.3%, P < 0.01). Nonetheless, both CG and SG depicted an increased abortion rate (52.5 vs. 41.9% P > 0.05), respectively. Results suggest that nutritional supplementation and the male effect were able to successfully invoke neurophysiological pathways to increase ovarian activity and to promote a uterine milieu prone to the establishment of pregnancy during the anoestrus season. However, the increased abortion rates observed in the study occurred irrespective of the nutritional regime offered during the premating stage. Therefore, there is a need to align the last third of gestation to the onset of the grazing season in order to increase reproductive and economic efficiency in those rangeland-based marginal goat production systems.

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Correspondence to Cesar A. Meza-Herrera.

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Urrutia-Morales, J., Meza-Herrera, C.A., Tello-Varela, L. et al. Effect of nutritional supplementation upon pregnancy rates of goats under semiarid rangelands and exposed to the male effect. Trop Anim Health Prod 44, 1473–1477 (2012). https://doi.org/10.1007/s11250-012-0090-8

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