Abstract
In this study, Feeding apparatus were designed and used. Each apparatus consisted of an 80 cubic cm wooden frame, with the surface, the base and the two length sides, and 2 feeding batteries with 2 lots in the frame, and an airway frame and an electrical fan. Each of the 3 apparatus were placed in 3 rooms where the temperature was controlled at T1, T2, and T3 respectively. For two of three apparatus, a wind of W2 and W3 for each temperature was blown against the front of the feeding batteries through an airway frame by a fan. One apparatus was used under a windless condition: W1 without an airway frame or a fan. At the level of T1, T2, and T3, it was kept at 24°C, 27°C, and 30°C respectively. A wind of 0.0m, 0.4, and 0.8per sec, at the level of W1, W2, and W3 was maintained for the air intake velocity respectively.
Five hundred and four 3-month-old female quail were divided into 9 groups, accomodated in the above apparatus and fed for 7 weeks under 9 combinations of 3 levels of ambient temperature, T1, T2, and T3, and 3 levels of wind velocity, W1, W2, W3. This experiment was repeated 3 times under the same conditions. The data were analysed statistically as two-way layout design.
1) It was calculated that, from the area of outlet and the velocity of air exhaust, the ventilated air per min, per bird for the 0.4m of air intake velocity is 0.037m3 and that for the 0.8m is 0.112m3.
2) Under the condition of W1, the egg production rate in the case of T1 and T2 was higher than that in the case of T3. No significant difference between the rate of T1 and T2 was found. The rate in the case of T1 decreased by causing the wind of W2, but no further decrease was observed by further increase of wind velocity. In the case of T2, no effect of wind velocity on the rate was observed. On the other hand, the rate in the case of T3 increased by causing the wind of W2 and W3. There was no significant difference between the rate by W2 and W3.
3) Under the condition of W1, the change of egg weight by temperature was similar to that of the rate by temperature; the egg weight was larger in the case of 24°C and 27°C, and smaller in the case of 30°C. The egg weight increased by causing the wind of W2 in each temperature level, but no further increase was observed by further increase of wind velocity.
4) Feed intake decreased about linearly with the rising of temperature from T1 to T3 in each case of W1, W2, and W3. The effects of wind for the feed intake in each temperature level were similar to that for the egg weight.
5) Feed efficiency was improved by the raise of temperature from T1 to T2, but no further improvement was observed by further rising of temperature. On the other hand, feed efficiency was lowered with the increasing of wind velocity from W1 to W3. But this lowering rate had a trend to decrease with the rising of temperature.
6) Water intake increased with the rising of temperature, and it decreased with the increasing of wind velocity.
7) From the above results, it is said that the wind in the case of 24°C brought about injurious effects on the egg production rate and the feed efficiency. As the wind of W2 in the case of 27°C brought about benificial effect on the increase of egg weight without lowering the egg production rate, this condition is superior to egg production, but it is undesirable for feed efficiency.
