Mellado Miguel, Rodríguez Iris J, Alvarado-Espino Alan, Véliz Francisco G, Mellado Jesús, García José E
Department of Animal Nutrition, Autonomous Agrarian University Antonio Narro, Saltillo, Mexico.
Department of Veterinary Science, Autonomous Agrarian University Antonio Narro, Torreon, Mexico.
Trop Anim Health Prod. 2020 Sep;52(5):2737-2741. doi: 10.1007/s11250-020-02264-z. Epub 2020 Mar 21.
The effect of concentrate supplementation to crossbred goats on rangeland during the dry period on their reproductive performance was investigated. Goats were assigned into two groups: a concentrate supplemented (S; n = 91) group and an unsupplemented (UNS; n = 118) group. S goats received 350 g/day of concentrate per head, 30 days prior to breeding (flushing in winter) and 30 days during the last trimester of pregnancy. UNS goats presented a lower (P < 0.01) liveweight at the onset of the breeding period than did the S group (38.2 ± 3.7 vs. 44.4 ± 3.6 kg). Average daily gains during pregnancy were higher (P < 0.01) in the S group than UNS goats (15.5 ± 1.2 vs. - 0.5 ± 5.1 g/d). S goats had a higher (P < 0.01) kidding rate (87.1%) than the UNS goats (54.7%). Litter size for UNS and S goats was 1.39 and 2.00, respectively (P < 0.01). Serum triiodothyronine, tetraiodothyronine, and cortisol concentration at the end of the flushing period were not affected by concentrate supplementation. Serum glucose (88.7 ± 3.8 vs. 95.7 ± 5.3 mg/dL), total protein (6.9 ± 1.1 vs. 8.2 ± 1.2 mg/dL), and blood urea nitrogen (17.1 vs. 21.0 ± 4.3 mg/dL) concentrations were lower for UNS goats as compared with S goats. In conclusion, concentrate supplementation in crossbred goats on rangeland markedly improved body mass changes during gestation and the reproductive performance, which implies that malnutrition is a major barrier affecting fertility of goats and liveweight of kids in this rangeland.
研究了在旱季给草原杂交山羊补饲精料对其繁殖性能的影响。山羊被分为两组：补饲精料组（S组；n = 91）和未补饲组（UNS组；n = 118）。S组山羊在配种前30天（冬季催情）和妊娠最后三个月期间，每头每天补饲350克精料。与S组相比，UNS组山羊在配种期开始时体重较低（P < 0.01）（38.2 ± 3.7 vs. 44.4 ± 3.6千克）。S组山羊妊娠期间的平均日增重高于UNS组山羊（P < 0.01）（15.5 ± 1.2 vs. -0.5 ± 5.1克/天）。S组山羊的产羔率（87.1%）高于UNS组山羊（54.7%）（P < 0.01）。UNS组和S组山羊的产仔数分别为1.39和2.00（P < 0.01）。催情期结束时，血清三碘甲状腺原氨酸、四碘甲状腺原氨酸和皮质醇浓度不受精料补饲的影响。与S组山羊相比，UNS组山羊的血清葡萄糖（88.7 ± 3.8 vs. 95.7 ± 5.3毫克/分升）、总蛋白（6.9 ± 1.1 vs. 8.2 ± 1.2毫克/分升）和血尿素氮（17.1 vs. 21.0 ± 4.3毫克/分升）浓度较低。总之，给草原杂交山羊补饲精料显著改善了妊娠期间的体重变化和繁殖性能，这表明营养不良是影响该草原山羊繁殖力和羔羊体重的主要障碍。
