Table 2. The linear regression between both factors (BS growth rate and diet) and ADG, ADFI, FCR, TMT and BW/ TMT.
| Intercept | BS growth rate | Diet | BS growth rate × Diet | R2 | P | |
|---|---|---|---|---|---|---|
| ADG | 30.4 *** | 0.85 *** | -4.4 ** | -0.39 ** | 0.97 | *** |
| ADFI | 71.3*** | 1.3 *** | 14.5*** | -0.33 | 0.97 | *** |
| FCR | 2.5 *** | -0.03 *** | 0.81 *** | -0.01 | 0.88 | *** |
| TMT | 8.3 *** | 0.05 *** | -0.56 ** | -0.03 | 0.82 | *** |
| BW/TMT | 140.5 *** | 3.1 *** | -8.7 | -1.0 | 0.91 | *** |
Coefficients of the linear regression of broiler chickens differing in breed-specific growth rate fed a commercial versus a scavenger diet correlated to the average daily gain (ADG), average daily feed intake (ADFI), feed conversion ratio (FCR), length of tarsometatarsus (TMT) and the ratio between the bodyweight and the length of the tarsometatarsus (BW/TMT). The factors in the equation are breed-specific (BS) growth rate and diet. The commercial diet was considered as the reference. The BS growth rates for each of the breeds used in this experiment are: 60g/ d for Cobb, 46g/ d for CobbSasso, 38g/ d for Sasso and 30g/ d for Sussex. R2 and the P-value of the linear regression models are given in the right colomns.
Superscripts represent the P-value:
* = <0.05
** = <0.01
*** = <0.001.