Proper levels of dietary protein and metabolizable energy on production performance and carcass quality of Pradu Hang Dam × Hubbard JA 57 Ki crossbred native chicken during 6-10 weeks of age
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Abstract
A total of healthy 1,440 crossbred native chickens (Pradu Hang Dam × Hubbard JA 57 Ki) at 5 weeks of age, composed of 720 males and 720 females were used in this study. Each sex of chickens was randomly allocated into 6 groups of 3 replicates containing 40 birds/replication. Chickens were raised in an open house with a 2 × 4 m area/pen during 6-10 weeks of age and fed with diets containing 19% vs 17% crude protein (CP). Each CP level contained 3 metabolizable energy (ME) levels (3.2 vs 2.9 vs 2.6 kcal/g) based on a 2 × 3 factorial in a randomized complete block design (RCBD) having sex as a block. The result revealed there was no statistically significant for interaction between CP and ME on for all parameters. Dietary CP level had no significant effects on body weight gain (BWG), average daily gain (ADG), feed intake (FI), feed conversion ratio (FCR), feed cost per kg BWG (FCG), and carcass composition (P > 0.05). Contrariwise, the highest ME diet (3.2 kcal ME/g) gave significantly higher BWG, ADG, and lower FI, resulted in better FCR and FCG than the lowest ME diet (2.6 kcal ME/g). In addition, the 3.2 and 2.9 kcal ME/g diet had significantly higher percentage of carcass, breast meat and abdominal fat, but lower percentage of liver, gizzard and whole intestine than the 2.6 kcal ME/g diet. Male had significantly higher BWG and FI with better FCR and FCG than female chicken. In addition, male also had significantly higher percentage of carcass, thigh, drumstick, but significantly lower percentage of wing, liver, heart, and whole intestine than females. The proper ration for Pradu Hang Dam × Hubbard JA 57 Ki during 6-10 weeks of age should contain 19% CP with 3.2 kcal ME/g.
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