The effects of a high ambient temperature and dietary fat supplement on nutrient digestibility of fattening pigs
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概要
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This study was undertaken to determine the effects of a high ambient temperature and 10 % of dietary animal fat supplement on nutrient digestibility of fattening pigs. In experiment 1, 18 barrows, of which average body weight was about 60 kg, were divided into 3 groups, high temperature (HT, 30°C), thermoneutral zone restricted feeding (TNZ restricted, 23°C), and thermoneutral zone ad libitum feeding (TNZ ad lib., 23°C) groups. The pigs were raised for 28 days under those ambient temperatures, and digestion trial was carried out in last 3 days. The HT and TNZ ad lib. groups were fed ad libitum. The average voluntary feed intake of the HT group pigs between 8 am and 2pm was 0.98% of their initial body weight, 1.66% between 2pm and 8pm, and 1.61% between 8pm and Sam. The TNZ restricted group pigs were given feed of which amount was equal to 0.98% of their initial body weight at Sam, 1.66% at 2pm, and 1.61% at 8pm in order to keep the daily feed intake and feeding pattern of the TNZ restricted group similar to those of the HT group. The nutrient digestibility of the HT group tended to be lower than those of the TNZ restricted group, and the difference in the dry matter digestibility was statistically significant. In experiment 2, 16 barrows, average body weight was about 85kg, were divided into 4 groups such as 30°C fat supplement, 30°C control, 18°C fat supplement, and 18°C control groups. The digestion trial was carried out in the same way as experiment 1, while the pigs were given feed ad libitum. Although the differences were not statistically significant, dry matter, energy, crude protein, and crude fat digestibilities of 30°C control group were all lower than those of 18°C control group. From these results obtained in experiment 1 and 2, it was suggested that continuous heat exposure to fattening pigs depressed their nutrient digestibility. On the other hand, dietary fat supplement depressed digestibilities of dry matter and energy, however the supplement enhanced crude fat digestibility under both ambient temperatures.
- 日本暖地畜産学会の論文
日本暖地畜産学会 | 論文
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