The effect of breeder age and egg storage time on phosphorus utilization by broiler progeny fed a phosphorus deficiency diet with 1alpha-OH vitamin D3.
Two experiments were conducted to determine that variation in broiler P utilization is due to breeder age and egg storage time. Experiment 1 was conducted with chicks hatched from eggs laid by Ross x Ross 308 breeders (27 vs. 61 wk old) and stored for 0 or 10 d. The age of breeders had significant effects (P < 0.05) on 0 to 16 d chick growth (379 +/- 18 vs. 308 +/- 19 for 27- and 61-wk-old breeders, respectively). The longer egg storage time of chicks from older breeders resulted in higher P rickets scores and incidence, but longer egg storage time of chicks from younger breeders resulted in lower P rickets score and incidence (significant interaction, P = 0.0455). The longer egg storage time of chicks from older breeders resulted in lower bone ash (%), and the longer egg storage time of chicks from younger breeders resulted in higher bone ash (%). Experiment 2 was conducted with chicks hatched from eggs laid by Ross x Ross 308 breeders (26 vs. 60 wk old) and stored for 0 or 10 d. The diets were P deficient and with or without 5 microg/g of 1alpha-OH cholecalciferol (1alpha-OH vitamin D(3)). Breeder age had significant effects (P = 0.0003) on 0 to 16 d chick growth (272 +/- 7 vs. 339 +/- 8 for 26- and 60-wk-old breeders, respectively) and chick mortality (P = 0.0134). The P rickets score increased with breeder age (P = 0.0186) and egg storage time (P = 0.1057). The factors influencing the incidence of P rickets in broilers should include breeder age and egg storage time as well as genetics and dietary levels of Ca, P, and vitamin D activity of the P-deficient diets.
Shim
M Y
MY
Department of Poultry Science, University of Georgia, USA.
Pesti
G M
GM
Bakalli
R I
RI
Edwards
H M
HM
D000818:Animals; D001835:Body Weight; D002117:Calcitriol; D002645:Chickens / Q000254:growth & development / Q000378:metabolism*; D019587:Dietary Supplements; D004531:Eggs; D005260:Female; D005524:Food Technology / Q000379:methods*; D010758:Phosphorus / Q000172:deficiency* / Q000378:metabolism*; D011201:Poultry Diseases / Q000378:metabolism; D014808:Vitamin D Deficiency / Q000378:metabolism* / Q000662:veterinary; D015430:Weight Gain
D010758:Phosphorus; D002117:Calcitriol