Effect of amino acid levels during broiler breeder pullet rearing on: 1. Growth and development

Dr Edgar, the results of your study are consistent. As it is normal for birds to vary in body weight in the experimental unit, I think it would be more correct to select the 3 birds with the body weight closest to the average weight of the experimental unit. This practice would avoid slaughtering birds of unrepresentative weight. Because you used regression, because you didn't set the level that gave the best results, instead of citing the two highest levels.

Your study confirms that pullets fed the lowest dietary AA level had the largest deposits of abdominal fat at end of rearing and onset of lay. So this is supposed to help average sexual maturity of your experimental flock. Is the low dietary AA level in rearing results in earlier sexual maturity? Higher early egg size? Better peak of lay?
Or is the low dietary AA level in rearing had positive or negative results in persistency of lay?

Thanks and Regards.

Jacky Michard
Poultry consultant