The improvement of growth and reproductive performances of White Roman geese in wet-pad forced ventilation house in summer
Shen-Chang Chang, Min-Jung Lin, Kuo-Chin Wu, and Yu-Shine Jea
This study was to investigate the effects of two age for the first egg, i.e. age of 10 month and 12 month for laying period, and two molting, i.e. with and without molting on the body weight gain and reproduction characteristics of White Roman geese kept in an environment-controlled house. Geese were randomly assigned to four treatments (2 ages at the first egg treatments × 2 molting treatments). Each treatment was replicated 2 times in an experimental unit. The results showed that the geese under age for the first egg of 10 month in comparison with those of 12 month had no significant improvement in body weight gain at the time when the geese were placed in the environment-controlled house. The geese of age for the first egg of 10 month comparing to those under age of 12 month have heavier body weight at the time when the geese were at the peak of egg production (4.99 vs. 4.80 kg, P = 0.0297). The geese of age for the first egg of 10 month comparing to those of 12 month have heavier body weight gain at the time when the geese were under 7 L : 17 D for 6 wks (0.264 vs. 0.089 kg, P = 0.0141), the geese under with molting comparing to those without molting have heavier body weight gain (0.237 vs. 0.115 kg, P = 0.0441) at the same period. The geese under age at the first egg and molting treatments had no significant in fertility, hatchability, and hatchability of fertilized egg cross laying period. The geese of age for the first egg of 12 month and without molting have longer laying period than other treatments. In conclusion, the geese of age for the first egg of 10 month results in higher laying rate of all period and hatchability at ESP1 (stage of egg production from 0 to 35 %). The geese of age for the first egg of 12 month were molted, it could improve its laying rate of all period and hatchability at ESP1.
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