Energy intake and milk production in mink (MUSTELA vison)‐effect of litter size

R. Fink, A. Tauson, K. B. Hansen, S. Wamberg, N. Kristensen
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引用次数: 24

Abstract

Energy intake and milk production were measured in 12 mink dams raising litters of 3, 6 and 9 kits one to four weeks post partum by means of balance experiments and measurements of milk intake of the kits by the water isotope dilution technique. The dams were fed ad libitum on a conventional wet mink diet (DM: 323 g/kg; CP: 173 g/kg; ME: 4.4 MJ/kg). Milk samples collected from dams with corresponding litter sizes and lactation weeks, and body composition of kits nursed by these dams, were analysed for content of DM, ash, N and fat. The ME and drinking water consumption were higher in dams nursing 9 kits than in dams nursing 3 kits. The N and water balances as well as the live weight of dams were not affected by litter size. Daily milk production was higher in dams nursing 9 kits than in dams nursing 3 kits. The DM, N and fat content of the milk increased during lactation, but were not affected by litter size. Individual kit live weight was higher in litters of 3 than in litters of 6 and 9 kits four weeks post partum. The DM and fat content of the kits were lowest in kits from litters of 9 kits, whereas these kits had the highest protein content. Daily ME for maintenance of kits and the efficiency of utilisation of ME in milk for body gain were estimated to 356 kJ/kg0.75, kp ≈0.53 and kf ≈0.71, respectively. In conclusion, daily milk production increased with increasing litter size, but not in proportion to the number of kits, indicating that milk production limits the growth rate of the young. In the fourth week of lactation, milk production was not different between dams nursing 6 or 9 kits, indicating a maximum capacity.
水貂能量摄入和产奶量(MUSTELA vision)‐产仔数的影响
采用平衡实验和水同位素稀释法测定产奶量,对产后1 ~ 4周分别饲养3、6、9只幼崽的12个水貂坝进行了能量摄入和产奶量的测定。饲喂常规湿貂饲粮(DM: 323 g/kg;CP: 173 g/kg;ME: 4.4 MJ/kg)。分析了相应产仔数和哺乳周数的母鼠的乳样,以及母鼠体组成中干物质、灰分、氮和脂肪的含量。饲粮9包的代谢能和饮水量均高于饲粮3包。产仔数对坝体氮、水平衡及活重影响不大。日产奶量9包的母鼠高于3包的母鼠。乳中DM、N和脂肪含量在泌乳期间均有升高,但不受产仔数的影响。产后4周,3窝的单包活重高于6窝和9窝的单包活重。9个雏鸡窝中各雏鸡的干物质和脂肪含量最低,蛋白质含量最高。维持幼崽的日代谢能和利用乳中代谢能增重的效率分别为356 kJ/kg0.75、kp≈0.53和kf≈0.71。综上所述,日产奶量随产仔数的增加而增加,但与产仔数不成正比,表明产奶量限制了幼崽的生长速度。在哺乳第四周,哺乳6只和9只的母鸭产奶量没有差异,表明有最大的产奶量。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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