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Crude protein level for meat type quail during the growing period
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Dr Helio Lima Neto
Correa GSS, Silva MA, Correa AB, Lima-Neto HR
Arquivo Brasileiro de Medicina Veterinária e Zootecnia
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The crude protein requirements for EV2 quail meat type genetic group during the growing period were estimated in a completely randomized experimental design, using 288 quails of both sex, six levels of crude protein (23, 25, 27, 29, 31 and 33%) and four replicates of 12 quails per experimental unit. Body weight (g), weight gain (g), feed intake (g) and feed:weight gain ratio (g/g) were recorded in each period (from hatch to 21 days and from hatch to 42 days of age). At 42 days of age, four quails were randomly sampled from each experimental unit (two males and two females) and slaughtered to record weights and yields of carcass, main cuts (thigh and breast) edible giblets (liver, gizzard and heart) and abdominal fat. Quadratic effects of crude protein level on body weight, weight gain and feed intake from hatch to 21 days of age, with maximum performances estimated for quails fed 30.64; 30.65 and 29.02% crude protein diets, respectively. Feed:weight gain ratio during this period showed a linear response in function of protein level of diet. Quadratic effect of protein level on body weight at 42 days of age was observed, with maximum performances estimated for quails fed 29.93 crude protein diets, while weight gain showed a linear response. Quadratic effects of crude protein level on weight gain and feed intake were also observed, with estimated maximum for quails fed 29.81 and 29.11% crude protein diets, respectively while body weight and carcass and breast weights were linearly affected. Higher performance were observed for quails fed diets with the highest protein level. A significant crude protein level x sex interaction was observed for breast yield, females showing linear response in function of crude protein level, while no effect on male breast yield was observed. Female body weight and breast and liver yields were higher for males crude protein. Crude protein requirements for maximum female and male weight gains are estimated in 30.65% from hatch to 21 days and 29.81% from hatch to 42 days of age while crude protein requirement for carcass and breast weights is estimated in 33%.
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