https://www.selleckchem.com/pr....oducts/bay-60-6583.h
We investigated the effect of photoperiod on performance, ovarian morphology, reproductive hormones levels, and their receptors mRNA expressions in laying ducks. After adaption, 300 252-day-old Jinding laying ducks were randomly allocated to 5 groups, receiving 12L12D, 14L10D, 16L8D, 18L6D, or 20L4D, respectively. Each treatment had 6 ****tes of 10 birds each. The feeding trial lasted 8 wk. Egg production, egg mass, and ADFI increased linearly and quadratically with increasing photoperiods (P 0.05). Besides, 16.93 and 16.93 h wer
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