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- Title
Sulfur amino acids requirements in broiler breeders weighed during the pre-initial growth phase.
- Authors
Da Silva, Marcelo; Teixeira Albino, Fernando; Narváez-Solarte, William; Santiago Rostagno, Horacio
- Abstract
Determine the nutritional requirements in Met+Cys for broiler breeder hens during the pre-initial growth phase. Birds were subjected to a basic diet deficient in Met+Cys with the minimum nutritional levels in essential amino acids. It contained 21,5% CP, 3050 kcal ME/kg and 0.688% Met+Cys supplemented with six levels of DL-methionine (0,00; 0,06; 0,12; 0,18; 0,24 and 0,30 %) resulting in diets with 0,688, 0,748, 0,808, 0,868, 0,928 and 0,988% of total Met+Cys, in randomized design blocks with twelve repetitions and eight birds per experimental unit. Body weight (BW), feed conversion (FC) and the effect of the treatments used in the initial phase on the reproductive performance in the period from 24 to 40 weeks of age were evaluated. The requirements in Met+Cys were calculated by polynomial regression and Plateau Linear Response models. Supplementing with DL-methionine was significantly influenced by BW, FC and the chemical composition of the shell at 5 weeks of age. The levels of Met+Cys used in the initial phase influenced only egg production in the period from 24 to 40 weeks and hatching of eggs at 40 weeks, with no effect either during the start of production, egg weight and hatching to 32 weeks nor in the body weight of one day old chicks. The recommendation of total Met+Cys in diets with 3050 kcal of ME/kg can be suggested in an amount of 0,75%, and this corresponds to 0,66% of digestible Met+Cys in the diet
- Subjects
SULFUR amino acids; BROILER chickens; DIETARY supplements; NUTRITION &; reproduction; PEPTIDES; LIVESTOCK reproduction
- Publication
Veterinary & Animal Science / Veterinaria y Zootecnia, 2015, Vol 9, Issue 2, p24
- ISSN
2011-5415
- Publication type
Article
- DOI
10.17151/vetzo.2015.9.2.3