Effect of Methionine and Energy Level in High Protein Organic Diets Fed to Laying Hens*
نویسندگان
چکیده
The objective of a 2 × 2 factorial study with laying hens was to evaluate the effect of dietary energy and DL-methionine (Met) supplementation in a high protein but sulphur amino acid deficient organic diet for laying hens on egg production, egg quality, and N retention and N excretion in manure. The model trial was conducted with 72 Bovans Brown hens from 24 to 53 weeks of age, allocated to 4 groups in 18 replicates. Each hen (replicate) was kept in an individual cage (40 cm × 40 cm) to enable individual feeding and collection of eggs. Hens were fed basal organic diets containing 180 g/kg crude protein and a lower (11.25 MJ) or higher (11.45 MJ) metabolizable energy (MEN) content. Basal diets contained relatively low levels of total methionine (2.63 g/kg) and sulphur amino acids (5.80 g/kg). The diets were supplemented or not with 0.6 g/kg DL-methionine (Met). Dietary energy level did not affect laying performance, but Met supplementation improved egg weight (P≤0.01), daily egg mass (P≤0.001), feed intake (P≤0.001), feed conversion per kg of eggs (P≤0.01) and yolk mass (P≤0.05). Met supplementation improved daily N retention (P≤0.05) and relative proportion of N retention to N intake (P≤0.01). The influence of Met on decreasing N content in excreta and N excretion was not statistically confirmed. A higher energy level in the diet, meanwhile, caused a statistically unverifiable increase in N content in excreta and daily N excretion in manure.
منابع مشابه
Response of laying hens to supplementation with various fatty acids when fed diets inadequate in protein and sulphur amino acids
متن کامل
بررسی تأثیر سطوح مختلف انرژی و نسبت انرژی به پروتئین جیره بر عملکرد مرغ‌های تخم‌گذار بومی استان فارس در مرحله دوم تخم‌گذاری
The effects of different levels of metabolizable energy and energy to protein ratios on the performance of Fars native laying hens were examined during the second laying phase. In a feeding trial, 216 Fars native hens 42 weeks old were randomly allotted to 9 experimental diets using 6 replicated groups of 4 birds per cage. The diets were formulated with 3 levels of ME (2700, 2900 and 3100 kcal/...
متن کاملبررسی تأثیر سطوح مختلف انرژی و نسبت انرژی به پروتئین جیره بر عملکرد مرغ‌های تخم‌گذار بومی استان فارس در مرحله دوم تخم‌گذاری
The effects of different levels of metabolizable energy and energy to protein ratios on the performance of Fars native laying hens were examined during the second laying phase. In a feeding trial, 216 Fars native hens 42 weeks old were randomly allotted to 9 experimental diets using 6 replicated groups of 4 birds per cage. The diets were formulated with 3 levels of ME (2700, 2900 and 3100 kcal/...
متن کاملاثر انرژی دوره پرورش و سطوح انرژی و چربی جیره تخم‌گذاری بر عملکرد مرغان‌های لاین
An experiment with 720 pullets was conducted to investigate the effect of dietary energy levels of pullet and dietary energy and fat of laying ration on subsequent performance parameters during 14-20 and 22-44 weeks of age. In the first period, white leghorn pullets were fed with two diets of low and high density energy (2600 and 3200 Kcal ME/kg). In the lating period (second period), birds, in...
متن کاملاثر انرژی دوره پرورش و سطوح انرژی و چربی جیره تخم‌گذاری بر عملکرد مرغان‌های لاین
An experiment with 720 pullets was conducted to investigate the effect of dietary energy levels of pullet and dietary energy and fat of laying ration on subsequent performance parameters during 14-20 and 22-44 weeks of age. In the first period, white leghorn pullets were fed with two diets of low and high density energy (2600 and 3200 Kcal ME/kg). In the lating period (second period), birds, in...
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