2 research outputs found
Exigência de lisina digestível e planos de nutrição para frangos de corte machos mantendo as relações metionina + cistina e treonina digestível na proteína ideal Digestible lysine requirements for male broilers keeping methionine + cystine and threonine ratios in the ideal protein
Um estudo foi conduzido para avaliar a exigência de lisina digestível e planos nutricionais para frangos de corte machos de alto potencial genético. Quatrocentos e noventa e cinco pintos de um dia, da marca comercial Cobb, com peso médio inicial de 45,6 ± 0,3g foram utilizados, distribuídos em delineamento inteiramente casualizado, com três dietas contendo diferentes níveis de lisina digestível, nove repetições e onze aves por unidade experimental para determinar o melhor nível de lisina para a fase pré-incial (1 a 7 dias de idade) e o melhor plano nutricional para o período total (1 a 21 dias de idade). Os níveis de lisina não influenciaram o consumo de ração das aves. O consumo de lisina digestível aumentou de forma linear com o aumento dos níveis deste aminoácido na ração. O ganho de peso aumentou e a conversão alimentar melhorou de forma quadrática com o aumento dos níveis de lisina digestível. A exigência de lisina digestível de pintos de 1 a 21 dias de idade para melhor ganho de peso e conversão é de 1,30 e 1,29% de lisina digestível, respectivamente, correspondendo aos consumos estimados de 2,68 e 2,64g de lisina digestível. O Plano nutricional PN3 atende as exigências nutricionais de frangos de corte de 1 a 21 dias de idade.<br>A study was conducted to evaluate the requirement of digestible lysine and nutrition plans for broilers with high genetic potential. Four hundred and ninety five one-day-old Cobb chicks with initial average weight of 45.6g±0.3g were used, allotted in a completely randomized design with three diets containing different levels of lysine, nine replicates, and 11 birds per experimental unit, to determine the best lysine level for the pre-starter phase (1 to 7 days old) and the best nutritional plan for the total period (1 to 21 days of age). Lysine levels did not influence broilers' feed intake. The digestible lysine intake increased linearly with increasing levels of this amino acid in the diet. Weight gain and feed conversion improved quadratically by increasing dietary levels of lysine. Digestible lysine requirement of 1-to-7-day-old male broilers is 1.30 and 1.29% for best weight gain and feed conversion, respectively, corresponding to intakes of 2.68 and 2.64g digestible lysine. The nutritional plan PN3 meets the nutritional needs of male broilers from 1 to 21 days of age
Digestible lysine levels in diets supplemented with ractopamine
In order evaluate digestible lysine levels in diets supplemented with 20 ppm of ractopamine on the performance and carcass traits, 64 barrows with high genetic potential at finishing phase were allotted in a completely randomized block design with four digestible lysine levels (0.80, 0.90, 1.00, and 1.10%), eight replicates and two pigs per experimental unit. Initial body weight and pigs' kinship were used as criteria in the blocks formation. Diets were mainly composed of corn and soybean meal supplemented with minerals, vitamins and amino acids to meet pigs' nutritional requirements at the finishing phase, except for digestible lysine. No effect of digestible lysine levels was observed in animal performance. The digestible lysine intake increased linearly by increasing the levels of digestible lysine in the diets. Carcass traits were not influenced by the dietary levels of digestible lysine. The level of 0.80% of digestible lysine in diets supplemented with 20 ppm ractopamine meets the nutritional requirements of castrated male pigs during the finishing phase