Panzuti Clémence, Mandrile Gaëlle, Duvaux-Ponter Christine, Dessauge Frédéric
PEGASE, INRA,Agrocampus-Ouest, 35042, Rennes,France.
UMR Modélisation Systémique Appliquée aux Ruminants, INRA,AgroParisTech, Université Paris-Saclay, 75005, Paris,France.
J Dairy Res. 2018 Aug;85(3):277-280. doi: 10.1017/S0022029918000377. Epub 2018 Jun 18.
The experiment reported in this Research Communication aimed to determine the combined effects of early weaning and post-weaning feeding level on growth, reproductive parameters and milk yield in Alpine goats. Sixty-four Alpine goat kids were weaned abruptly at either 12·2 (±1·40) kg (40 d of age, E) or 17·7 (±2·30) kg (60 d of age, No). After weaning, E and No goats were subjected to 2 feeding strategies (n = 16): ad libitum concentrate until 130 d of age and then 620 g DM/d/goat until 200 d of age (EC and NoC) or ad libitum concentrate until 200 d of age (EAL and NoAL). Goats were weighed twice a month until 200 d of age. Pregnancy rate and litter size were recorded. Daily milk yield was measured by milk meter during the first lactation. Up to 60 d of age, average daily gain (ADG) of E kids was significantly lower than No kids. From 60 to 130 d of age, ADG of the four treatments were not different. After 130 d of age, EC and NoC kids had lower ADG than EAL and NoAL kids. Pregnancy rates of EAL and NoAL goats were lower than those of EC and NoC. Milk yield was not modified by weaning weight or feeding management. Milk quality was not affected by any treatment. To conclude, the age at weaning as well as the feeding level after weaning did not negatively impact growth and milk yield. We hypothesise that the establishment of the lactation function is not impacted by rearing management. Hence, decreasing the age at weaning could be an interesting way to reduce the cost of the rearing period in goat kids.
本研究通讯中报道的实验旨在确定早期断奶和断奶后饲养水平对阿尔卑斯山羊生长、繁殖参数及产奶量的综合影响。64只阿尔卑斯山羊羔羊在体重达到12.2（±1.40）千克（40日龄，E组）或17.7（±2.30）千克（60日龄，No组）时突然断奶。断奶后，E组和No组的山羊接受两种饲养策略（n = 16）：自由采食精料至130日龄，然后每只山羊每天620克干物质直至200日龄（EC组和NoC组），或自由采食精料直至200日龄（EAL组和NoAL组）。山羊每月称重两次直至200日龄。记录妊娠率和产仔数。在第一次泌乳期间用挤奶计量器测量日产奶量。60日龄前，E组羔羊的平均日增重（ADG）显著低于No组羔羊。60至130日龄期间，四种处理的ADG无差异。130日龄后，EC组和NoC组羔羊的ADG低于EAL组和NoAL组羔羊。EAL组和NoAL组山羊的妊娠率低于EC组和NoC组。断奶体重或饲养管理对产奶量没有影响。任何处理均未影响奶品质。总之，断奶年龄以及断奶后的饲养水平对生长和产奶量没有负面影响。我们推测泌乳功能的建立不受饲养管理的影响。因此，降低断奶年龄可能是降低山羊羔羊育成期成本的一种有效方式。
