Effect on growth performance, carcass traits, and myostatin gene expression in Aseel chicken fed varied levels of dietary protein in isocaloric energy diets.
Study Goal
The researchers aimed to determine the optimal crude protein (CP) level in isocaloric diets for maximizing growth performance, carcass traits, and myostatin gene expression in Aseel chickens.
Results Summary
The study found that 21% CP in a 2800 kcal ME/kg diet significantly improved body weight gain, feed efficiency, and dressing percentage, while down-regulating myostatin gene expression in breast muscle tissue compared to lower CP levels.
Population
Aseel chickens (210 day-old chicks)
Effective Dosage
Varying CP levels (18.5%, 19.0%, 19.5%, 20.0%, 20.5%, 21.0%, 21.5%) in isocaloric diets (2800 kcal ME/kg)
Duration
16 weeks
Interactions
None mentioned
| Intervention | Direction | Endpoint | Population | Dosage | Impact | Claim # |
|---|---|---|---|---|---|---|
different crude protein (CP) levels with isocaloric metabolizable energy (ME) diets | increase | body weight gain (BWG) | Aseel chicken | - | had a significant effect | #1 |
21% CP diet | increase | body weight | Aseel chicken | 223.53 g more than the lowest CP (18.5%)-fed group | gained more than | #2 |
different CP levels | no change | feed intake | Aseel chicken | - | did not significantly influenced | #3 |
21.0% CP diet | increase | feed efficiency (FE) | Aseel chicken | 3.86 to 4.06 | showing the best | #4 |
21% CP diet | increase | dressing % | Aseel chicken | 70.61 | observed the maximum | #5 |
CP 21% diet | decrease | MSTN gene expression in breast muscle tissue | Aseel chicken | 0.07 folds when compared to the diet of CP 20% | down-regulated | #6 |
21% CP in an isocaloric diet of 2800 kcal ME/kg | increase | growth performance | Aseel chickens | - | would be optimum to improve | #7 |
A study was conducted to assess the effect of feeding different crude protein (CP) levels with isocaloric metabolizable energy (ME) diets on growth performance, carcass traits, and myostatin (MSTN) gene expression of Aseel chicken during 0 to 16 weeks of age. A total of two hundred and ten day-old Aseel chickens were randomly allotted to seven dietary treatment groups. Each group had thirty chicks distributed into three replicates of ten chicks in each. Experimental diets were formulated to have varying levels of CP, viz. 18.5, 19.0, 19.5, 20.0, 20.5, 21.0, and 21.5%, with isocaloric energy of 2800 kcal ME/kg diets of mash feed fed to birds in a completely randomized design. Different CP levels had a significant effect (P < 0.05) on the body weight gain (BWG) of Aseel chicken. At the end of 16 weeks of age, the group fed 21% CP gained 223.53 g more than the lowest CP (18.5%)-fed group. The different CP levels did not significantly (P > 0.05) influenced the feed intake of all treatment groups, but numerically highest feed intake was observed in the lowest CP (18.5%)-fed group. However, significant differences in feed efficiency (FE) appeared from the 13th week only with the 21.0% CP-fed group showing the best FE until the 16th week (3.86 to 4.06). The maximum dressing % (70.61) was observed by the 21% CP-fed group. The CP 21% diet down-regulated the MSTN gene expression in breast muscle tissue to 0.07 folds when compared to the diet of CP 20%. The best economical coordinates for maximum performance for Aseel chicken appeared to be CP of 21% and ME of 2800 kcal/kg to achieve the best FE of 3.86 at the earliest age of 13 weeks. In conclusion, 21% CP in an isocaloric diet of 2800 kcal ME/kg, in Aseel chickens, would be optimum to improve the growth performance at maximum in terms of BWG and FE up to 16 weeks of age.