Effect of dietary energy, protein, and lysine content on performance and yields of two strains of male broiler chicks.
In a factorial arrangement of treatments Arbor Acres and Ross male broiler chicks were given four diets with 3,200 kcal ME/kg and four diets with 2,880 kcal ME/kg, two CP levels per energy level (23.1 and 33.6% in the high-energy diet and 21.0 and 29.7 in the low-energy diet) and two Lys levels per CP level per energy level (1.20 and 1.36% per CP level in the high-energy diets and 1.08 and 1.22% per CP level in the low-energy diets). The diets were given to 8 wk of age. Weight gain of Arbor Acres chicks was significantly higher (P less than .05) than that of Ross chicks at 6 and 7 wk of age, but feed to gain ratios were also significantly higher (P less than .05) at 6, 7, and 8 wk of age. Weight gain and feed to gain ratios were significantly better (P less than .05) on the high-energy diets than on the low-energy diets at 6, 7, and 8 wk of age. With equal Lys content, the normal-CP diets gave significantly higher gains (P less than .05) than the high-CP diets at 6, 7, and 8 wk of age. With equal CP content, the high-Lys diets gave significantly more gain (P less than .05) than the normal-Lys diets at 6, 7, and 8 wk of age. Oven-ready and breast meat yields of Ross chicks were significantly higher (P less than .001) compared with those of Arbor Acres chicks at 6, 7, and 8 wk of age and yields of edible organs, skin and fat, and remaining carcass were significantly lower (P less than .05).(ABSTRACT TRUNCATED AT 250 WORDS)
Holsheimer
J P
JP
Spelderholt Centre for Poultry Research, Beekbergen, The Netherlands.
Veerkamp
C H
CH
D000821:Animal Feed; D000818:Animals; D001947:Breeding; D002645:Chickens / Q000235:genetics / Q000254:growth & development*; D004044:Dietary Proteins / Q000008:administration & dosage*; D004435:Eating; D002149:Energy Intake; D008239:Lysine / Q000008:administration & dosage*; D008297:Male; D008460:Meat / Q000592:standards; D009026:Mortality; D015430:Weight Gain
D004044:Dietary Proteins; D008239:Lysine