子豚の体温調節性生理反応の日内変化と飼料摂取量の影響 Diurnal Variation of Thermoregulatory Responses in Piglets under Fasting and Feeding
In order to obtain a better understanding of the characteristic of thermoregulation in piglets, variations in thermoregulatory responses were studied in four female piglets in a constant environmental temperature of 25°C where they received one of the three levels of feed at TDN level of 0, 60, 96g/kg<sup>0.75</sup> d. The daily feed was distributed in equal quantity at 0800h and 2000h to standardize heat production (HP) from feed ingestion. The influence of HP on rectal temperature (Tr), surface temperature (Ts) and respiration rate (RR) was clearly observed. The Tr and RR were greater during the 1300-1700h than during the 0100-0500h, and the difference of Tr was 0.3-0.8°C. The mean surface temperature (mTs) and Ts of tip sites such as ear tip, snout and pastern were greater during the 0100-0500h than during the 1300-1700h, and the difference of Ts of tip sites was 4-5°C. The contrast in the daily pattern of RR and mTs was conspicuous features. This may indicate that the increased sensible heat loss by mTs was to supplement heat balance with the decrease in evaporative heat loss of respiration during 0100-0500h.
- 日本畜産學會報 = The Japanese journal of zootechnical science
日本畜産學會報 = The Japanese journal of zootechnical science 71(10), J510-J515, 2000-10-25
Japanese Society of Animal Science