The following treatments were evaluated for 120 consecutive days: feeding level to achieve an ADWG of 600g/d (TMEDIUM), or feeding level to achieve an AGWD of 800g/d (THIGH).
In this experiment, heifers were limit-fed with a single nutrient-dense TMR to achieve the preplanned ADWG, which was offered once a day, as a result, animals consumed the TMR very quickly and in a short period in both treatments.
As expected, the ADWG was lower for TMEDIUM than THIGH (597 vs.
Although, cattle exposed to a previous nutritional restriction can compensate a lower ADWG by growing at faster rates once they are offered a greater amount of feed (DROUILLARD et al., 1991), in our study this was not observed, and it is possible that the magnitude, the duration, or both, of the dietary restriction in TMEDIUM was not enough to elicit an acceleration of the ADWG characteristic of that compensatory growth.
Increase in dietary ME level up to 2900 kcal/kg was associated (P0.01) with increase in ADWG throughout the experimental period (Table 2).
Similarly, daily CP intake was positively correlated with ADWG, ADFI and carcass yield.
In general, there was no significant difference between ADWG of birds fed diets containing 2900 and 3000 kcal ME/kg.
Increase in dietary CP level to 24% improved (P0.001) ADWG of both quail species, but this effect was more obvious for Japanese quails.
Increased ADFI and ADWG in chicks fed on higher CP diets may be, in part, related to the higher amino acid density, because the birds appear to respond to amino acid concentration rather than dietary CP level (Straznicka, 1990).
There were high correlations among ADWG and carcass components (positive correlation), as well as between FCR and these traits (negative correlation).
Earley and Crowe (2002) also observed that calves castrated surgically had a lower ADWG than un-castrated calves.
Reported that ADWG were higher in the non-castrated animals as compared to the castrated calves whether animal were castrated before or after puberty (Biagini and Lazzaron, 2007; Xiao et al., 2014).