Exigência de metionina + cistina para poedeiras comerciais semi pesadas
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Data
2022-12-02
Autores
Mani, Tatyany Soledade Andrade
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
A metionina é considerada o primeiro aminoácido essencial limitante nas dietas formuladas a base de milho e farelo de soja para aves de postura. Ela atua na síntese de proteínas, no sistema imunológico, nas reações metabólicas, no desempenho e empenamento das aves por meio da síntese de colina, betaína creatina, carnitina, atuando, ainda, como regulador de divisão celular. A cistina é importante para a formação da pele e penas, estimula o sistema hematopoiético, promove a formação de glóbulos brancos e vermelhos além de contribui para o processo de cicatrização. O presente trabalho visa determinar as recomendações de metionina + cistina para galinhas poedeiras. Para isso, foi realizado um ensaio com 150 galinhas poedeiras da linhagem Hy-line Brown com duração de 10 semanas. O delineamento utilizado foi inteiramente casualizado, com 15 tratamentos e 10 repetições de uma ave cada. Os tratamentos consistiram em sete níveis de metionina + cistina digestível 4,15; 4,47; 5.39; 6.01; 6,63; 7,25 e 8,06 g/kg. Portanto, as variáveis analisadas foram EW (g), EP (%), FI (g/aveꞏd), PC (g), conversão alimentar por produção de ovos (FCR, g/g), corrigida para mortalidade, produção de ovos (EO, g/aveꞏd), ingestão de metionina+cistina (mg/aveꞏd) e deposição de metionina+cistina no ovo (mg/aveꞏd), eficiência de utilização e manutenção. As variáveis coletadas para a qualidade do ovo foram peso da gema (g), peso da casca (g) e altura do albúmen (mm). Esses dados foram coletados na terceira, sexta e décima semana do experimento, dois dias por semana. Quando o efeito dos níveis de metionina+cistina (P ≤ 0,05) foi detectado, os modelos linear-platô (BL), quadrático-platô (BLq) e o primeiro intercepto foram ajustados para determinar a ingestão ideal de metionina+cistina. O valor calculado da primeira intersecção de BLq no platô da BL foi de 596,9 mg/ave por dia, considerado o nível ótimo de ingestão de metionina+cistina para produção de ovos em poedeiras Hy-line Brown.
ING HENS Methionine is considered the first limiting essential amino acid in diets based on corn and soybean meal for laying hens. It acts on protein synthesis, the immune system, metabolic reactions, performance and feathering of birds through the synthesis of cho line, betaine, creatine, carnitine, and acts as a cell division regulator. process. Cystine is important for the formation of skin and feathers, stimulates the hematopoietic system, promotes the formation of white and red blood cells, and contributes to the healing Thepresent work aims determine the recommendations of methionine + cystine for laying hens. For that, an assay was carried out with 150 laying hens of the Hy line Brown strain with a duration of 10 weeks. The design used was completely randomize d, with 15 treatments and 10 repetitions of one bird each. Treatments consisted of seven levels of methionine + digestible cystine 4.15; 4. 4 7; 5.39; 6.01; 6.63; 7.25 and 8.06 g/kg. Therefore, the variables analyzed were EW (g), EP (%), FI (g/birdꞏd), BW ( g), feed conversion ratio by egg output (FCR, g/g), corrected for mortality, egg output (EO, g/birdꞏd), methionine+cystine intake (mg/birdꞏd) and methionine+cystine deposition in egg (mg/birdꞏd), efficiency of utilization and maintenance. The variables col lected for egg quality were yolk weight (g), shell weight (g) and albumen height (mm). These data were collected on third, sixth and tenth week of the experiment, two days of week. When the effect of methionine+cystine levels (P ≤ 0.05) was detected, the models linearplateau (BL), quadraticplateau (BLq), and the first intercept were adjusted to determine the ideal methionine+cystine intake. The calculated value of the first interception of BLq on the plateau of the BL was 596.9 mg/bird per day, which was considered the optimum level methionine+cystine intake for egg output in Hy Keywordsline Brown laying hens.
ING HENS Methionine is considered the first limiting essential amino acid in diets based on corn and soybean meal for laying hens. It acts on protein synthesis, the immune system, metabolic reactions, performance and feathering of birds through the synthesis of cho line, betaine, creatine, carnitine, and acts as a cell division regulator. process. Cystine is important for the formation of skin and feathers, stimulates the hematopoietic system, promotes the formation of white and red blood cells, and contributes to the healing Thepresent work aims determine the recommendations of methionine + cystine for laying hens. For that, an assay was carried out with 150 laying hens of the Hy line Brown strain with a duration of 10 weeks. The design used was completely randomize d, with 15 treatments and 10 repetitions of one bird each. Treatments consisted of seven levels of methionine + digestible cystine 4.15; 4. 4 7; 5.39; 6.01; 6.63; 7.25 and 8.06 g/kg. Therefore, the variables analyzed were EW (g), EP (%), FI (g/birdꞏd), BW ( g), feed conversion ratio by egg output (FCR, g/g), corrected for mortality, egg output (EO, g/birdꞏd), methionine+cystine intake (mg/birdꞏd) and methionine+cystine deposition in egg (mg/birdꞏd), efficiency of utilization and maintenance. The variables col lected for egg quality were yolk weight (g), shell weight (g) and albumen height (mm). These data were collected on third, sixth and tenth week of the experiment, two days of week. When the effect of methionine+cystine levels (P ≤ 0.05) was detected, the models linearplateau (BL), quadraticplateau (BLq), and the first intercept were adjusted to determine the ideal methionine+cystine intake. The calculated value of the first interception of BLq on the plateau of the BL was 596.9 mg/bird per day, which was considered the optimum level methionine+cystine intake for egg output in Hy Keywordsline Brown laying hens.
Descrição
Palavras-chave
Galinhas poedeiras, Aminoácidos, Produção de ovos, Metionina, Cistina