Abstract
This experiment was carried with Japanese quails in the egg production phase with the objective of determining the requirements of digestible methionine + cystine (M+C) for higher production and egg quality. A total of 240 Japanese quails were distributed in a randomized complete block design. The basal diet was supplemented with different DL-methionine levels, corresponding to digestible methionine + cystine levels of 0.55, 0.61, 0.67, 0.73 and 0.79%. The characteristics analyzed were feed intake (g/quail/day), egg production (%), egg weight (g), egg mass (g/quail/day), feed conversion (dozen eggs/egg mass and kg feed/dozen eggs), egg shell (% and g), albumen (% and g), yolk (% and g) and specific gravity (g/cm³). The digestible M+C level for Japanese quails was 0.696% in the diet, corresponding to a daily intake of 186.7 mg/quail.
Highlights
Quail breeding for meat or eggs is an activity of considerable economic importance, which always creates new ventures
This experiment was carried with Japanese quails in the egg production phase with the objective of determining the requirements of digestible methionine + cystine (M+C) for higher production and egg quality
No differences were observed for consumption, increasing methionine + cystine levels were sufficient to affect egg production, egg mass, feed conversion by egg mass and per dozen eggs in a quadratic way, and the average egg weight, in a linear way
Summary
Quail breeding for meat or eggs is an activity of considerable economic importance, which always creates new ventures. It deserves special attention because there are no management and nutrition techniques that meet, in terms of economic and productive efficiency, the ability of the animal to synthesize tissues. Feeding is the most valuable item in the production cost, and among nutrients, crude protein usually most affects the final price of the diet. With increased quail egg production, the nutritional levels of diets have to be corrected, methionine, which in diets based on corn and soybean meal, is considered the first limiting amino acid. A diet containing levels below or above the animal requirements can significantly affect productivity
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