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The pituitary hormone prolactin has a wide variety of functions involving growth, behavioral, and ovarian activities in chickens. The objectives of the present study were to identify polymorphisms in the prolactin promoter and estimate their effects on growth traits in White Leghorn chickens. Among 28 haplotypes found, the h1 haplotype was predominant. Body weight at 16 and 64 weeks and age at sexual...
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