Comparison of the growth performances and carcass characteristics of three commercial broiler chicks in Iran in different nutritional condition

Document Type : Research Paper

Authors

Abstract

An investigation was carried out to evaluate growth performance and carcass characteristics of three commercial broiler strain ( A, B, C ), during four husbandry period in randomized complete block design with three treatment include stains and four block based on nutrition program include four phasing diets, high energy and high protein diets, pellet from diets and low energy and low protein diets. Husbandry conditions including environmental and managmental factors, were the same for three strains during each experimental periods.
The traits under consideration were daily body weight gain, daily feed intake, feed conversion ratio, means of live body weight, index of production, livability, carcass percentage, percent of breast, thigh and abdominal fat in end of 42th days of age. Statistical analysis of performance criteria showed that difference of daily weight gain in 42 days among of strain was significant and B had highest and C had lowest means of daily weight gain (P<0.05). Effect of nutrition program in this trait was significant and pellet form diets had highest and four phasing diets had lowest daily weight gain (P<0.05). Difference in means of daily feed intake in strains was very significant and B and C were highest and lowest respectively. Effect of nutrition program on daily feed intake was significant and pellet form diets was highest and four phasing diets was lowest in this trait (P<0.05).
Analysis of average of live body weight show the significant difference among the strains and B had highest and C lowest amount in this trait (P<0.05).  Effect of nutrition program on this trait was significant and diets with low protein and energy and pellet form diets were highest and diets with high energy and protein was lowest (P<0.05). There were no significant difference between strains and nutrition program in feed efficiency ratio.
The effect of nutrition program on livability was significant and diets with high level of energy and protein was highest and four phasing diet was lowest in livability (P<0.05). Also Carcass percentage had significant difference among strains and B had highest and C had lowest in this trait (P<0.05). The effect of nutrition program on this trait was significant and diets with high energy and protein had highest and diets with low protein and energy had lowest means of carcass percentage (P<0.05). Strain had significant influence on breast percentage and B had highest and C had lowest of breast percentage, respectively. Significant effect of strain on thigh percentage was observed and C and B had highest and lowest percentage of thigh respectively. Strain had very significant effect on abdominal fat percentage and B had highest and A had lowest abdominal fat percentage (P<0.05).
Calculated production index showed that effect of strain was significant and B had highest and C had lowest amount of this index (P<0.05). Effect of nutrition program on production index was significant and diets with high energy and high protein and pellet form diets had highest and four phasing diets and diets with low energy and low protein had lowest amounts of production index (P<0.05).

References

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Animal Sciences Journal
Volume 29, Issue 111
August 2016
Pages 25-34

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