Effects of short light regimes and lower dietary protein content on the reproductive performance of White Roman geese in an environment-controlled house.

The objective of this study is to investigate the effects of short light regimes and lower dietary protein content on the reproductive performance of White Roman geese in an environment- controlled house. Thirty-two ganders and 80 geese during the third laying period were allotted into 16 pens, randomly assigned into a split-plot design with two different lighting regimes: (1) short light regimes (SL) with 6.5h of light and 17.5h of dark (6.5L:17.5D), and (2) long light regimes (LL) with 19L:5D during the 6-wk prelaying period, followed by two different levels of protein diets (Low CP: 15% vs. High CP: 18%) for the laying period. The results showed that birds treated with the SL light regime had a heavier body weight compared to those treated with LL at the arrival of the peak period of egg production (6.19 vs. 5.87kg, P<0.05). Geese under LL had a longer laying period than those under SL treatment (277 vs. 175day, P<0.05), while the geese under SL treatment had a higher laying intensity (15.4% vs. 12.6%, P<0.05), fertility and hatchability than those under LL treatment. Our results suggest that the White Roman geese treated with 6-wk short light regime during the prelaying period and on the low CP diet during the laying period found conditions sufficient to sustain their regular reproduction performance, which would benefit geese farmers in the perspectives of energy saving and prolonged laying period.