Zhou Xiaoling, Yan Qiongxian, Yang Hong, Ren Ao, Kong Zhiwei, Tang Shaoxun, Han Xuefeng, He Zhixiong, Bamikole Musibau Adungbe, Tan Zhiliang
CAS Key Laboratory for Agro-Ecological Processes in Subtropical Region, National Engineering Laboratory for Pollution Control and Waste Utilization in Livestock and Poultry Production, South-Central Experimental Station of Animal Nutrition and Feed Science in Ministry of Agriculture, Institute of Subtropical Agriculture, The Chinese Academy of Sciences, Changsha 410125, China.
University of The Chinese Academy of Science, Beijing 100049, China.
Animals (Basel). 2019 Apr 17;9(4):173. doi: 10.3390/ani9040173.
Nutritional status during mid-gestation is often ignored under extensive husbandry. This study aimed to examine the effect of maternal undernutrition during mid-gestation on kid meat production under an extensive system. Twenty-seven goats (45 ± 3 d of gestation) were randomly assigned to an unrestricted group (100% of nutrient requirements), or a restricted group (60% of nutrient requirements from 45 to 100 d of gestation, and then re-alimented to 100%). Among the offspring, 16 eligible kids (eight per treatment) were selected, based on birth type and survival, and were harvested to evaluate the meat yield, quality, and composition at 90 d after birth. Maternal undernutrition reduced the body weight and size, average daily gain and hot carcass weight of the kids ( < 0.05). The lightness of the meat at 45 min postmortem was increased ( = 0.029) in the restricted kids. Apart from an increase in tyrosine concentration ( = 0.046), the proximate composition and the amino acid and fatty acid profiles were unaffected in the restricted kids ( > 0.05). Overall, maternal undernutrition during mid-gestation decreased the yield of kid meat, but did not significantly modify the quality and composition. These results highlight the importance of nutrient status during mid-gestation in the meat production of small ruminants under an extensive regime.
在粗放式养殖模式下，妊娠中期的营养状况常常被忽视。本研究旨在探究妊娠中期母体营养不足对粗放式养殖体系下羔羊产肉性能的影响。将27只山羊（妊娠45±3天）随机分为自由采食组（满足100%营养需求）和限饲组（妊娠45至100天期间满足60%营养需求，之后恢复至100%）。在后代中，根据出生类型和存活情况挑选出16只合格羔羊（每组8只），并在出生后90天进行屠宰，以评估产肉量、肉质和肉的成分。母体营养不足降低了羔羊的体重、体尺、平均日增重和热胴体重（P<0.05）。限饲组羔羊宰后45分钟肉的亮度增加（P = 0.029）。除酪氨酸浓度升高外（P = 0.046），限饲组羔羊的常规成分、氨基酸和脂肪酸谱未受影响（P>0.05）。总体而言，妊娠中期母体营养不足降低了羔羊的产肉量，但对肉质和肉的成分没有显著影响。这些结果凸显了妊娠中期营养状况对粗放式养殖模式下小反刍动物产肉性能的重要性。
