Relationship of energy, phosphorus and breed of chicken to growth and food efficiency
Titel:
Relationship of energy, phosphorus and breed of chicken to growth and food efficiency
Auteur:
Gardiner, E. E.
Verschenen in:
British poultry science
Paginering:
Jaargang 12 (1971) nr. 1 pagina's 31-39
Jaar:
1971-01
Inhoud:
Three trials were conducted to determine the response of two breeds of chickens (Single Comb White Leghorn—SCWL—and commercial crossbred broiler type) to various dietary energy and phosphorus levels. Dietary energy level, dietary phosphorus level and breed each had a consistent highly significant (P<0.01) effect on body weight at 4 weeks of age. A number of significant (P<0.05) and highly significant (P < 0.01) interactions occurred with body weight. The energy x phosphorus interaction was significant (P< 0.05) in the three trials which supports the conclusion that, in the heavy breed at least, the higher the energy level of the diet, the greater the phosphorus requirements. The phosphorus x breed interaction was highly significant (P <0.01) in the three trials supporting the conclusion that the two breeds differed in their phosphorus requirements. The energy x breed interaction was less consistent being highly significant (P < 0.01) in one trial, significant (P < 0.05) in another, and non-significant in a third. Dietary energy level, breed, and energy x breed were the most consistent factors influencing food-to-gain ratio. Mortality was high (20 per cent) when the broiler-type chickens were fed low phosphorus, low energy diets and increased with each increase in the energy level of the diet. No treatment effect on mortality was observed with the SGWL.
Tijdschrift beschrijving