Seyed Yavar Heydari; Nasrollah Pirany; Behnam Ahmadipour; Mohammad Reza Akbari
Volume 22, Issue 3 , September 2020, , Pages 441-455
Abstract
This study was conducted to investigate the weight changes, age and weight at first laying, the outer and inner egg characteristics of breeding station of Isfahan native chickens. Three hundred-day old native chickens were used in this survey. The experiment was started from the first day to the end ...
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This study was conducted to investigate the weight changes, age and weight at first laying, the outer and inner egg characteristics of breeding station of Isfahan native chickens. Three hundred-day old native chickens were used in this survey. The experiment was started from the first day to the end of the 12 weeks of egg production (32 wks. of age). The results indicated that average age and weight of the first laying hens were 152.6 days and 2061.46 g, respectively. The overall average of the egg weight was 45.47 g in whole production period. The average number of eggs produced by each hen in 12 weeks of production period was 42. The range of hen production percentage in each week was 5.83 to 61.99 with an average of 45.44. The regression curves of height and diameter of yolk with production weeks were in order of second; with the weight of the hen's body, the white and yolk weight, and the shell thickness were of third order and with the rest of the traits were in forth order. Correlation of age at first egg with shell weight was high (r =0.99) and highly significant (P <0.001), but with total egg weight, the length and weight of the egg, and the height of yolk was negative and significant (P <0.05). The results of this experiment indicated the good production potential in some of these birds which proper breeding programs may led to improve their productivity.
saeed rahimian; Nasrollah Pirany; F Khajali; Abdolnaser Mohebi
Volume 21, Issue 1 , April 2019, , Pages 37-48
Abstract
In order to measure some of the blood serum biochemical parameters in normal rearing conditions and determination of their relationship with body weight and carcass components and also the examination of sex effect on blood biochemical parameters in Isfahan native chicken, an experiment was conducted ...
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In order to measure some of the blood serum biochemical parameters in normal rearing conditions and determination of their relationship with body weight and carcass components and also the examination of sex effect on blood biochemical parameters in Isfahan native chicken, an experiment was conducted using 200 one-day-old native chickens. The chicks were reared in completely identical conditions for 12 weeks. At the end of week 12 and after six hours of fasting, the chicks were slaughtered, and their body weight and various carcass components were measured. The cholesterol, triglyceride, total protein, albumin, uric acid, calcium, phosphorus, malondialdehyde, high density lipoprotein and glucose concentrations were measured using commercial kits. The amount of globulin was calculated as the difference of total protein and albumin. The results showed that the highest significant positive correlation (P<0.05) was observed between cholesterol with body weight and thigh weight (0.21) and the highest significant negative correlation was observed between uric acid concentration and liver weight, and between calcium and breast weight (-0.24). The multiple regression analysis showed that cholesterol, globulin and phosphorus parameters could be used to predict body and breast weights, as well as cholesterol and globulin levels for predicting of carcass and thigh weights. In addition, there was no significant difference between two sexes in any of the measured biochemical parameters. According to the results of this experiment, blood parameters could be used to predict some carcass characteristics in Isfahan native chicken.