title: Calculation and evaluation of energy: amino acid ratios for the egg-production type hen.
abstract: Published equations for estimating the daily energy needs of laying hens were combined with published equations for estimating the daily amino acid needs to derive estimated energy:amino acid ratios for laying hens at different stages of production and environmental temperatures. Two feeding trials were conducted using various percentages of the suggested ratios to determine their applicability. The results of these studies indicate that the calculated energy:amino acid ratios appeared to support production levels comparable with those of hens fed higher nutrient levels. The use of temperature-adjusted energy:amino acid ratios appears to be a valid and feasible means of formulating diets to meet the changing nutritional needs of laying hens.
mesh_terms: D000367:Age Factors; D000596:Amino Acids / Q000378:metabolism*; D000818:Animals; D001835:Body Weight; D002645:Chickens / Q000502:physiology*; D004734:Energy Metabolism; D005260:Female; D008954:Models, Biological; D009751:Nutritional Requirements; D010058:Oviposition; D013696:Temperature
chemical_list: D000596:Amino Acids