Effect of age on feed efficiency and carcass yield characteristics of indigenous bull

Abstract

The study was conducted with the objectives to understand the effect of age of native Pabna bulls on feed conversion ratio (FCR), digestibility and carcass yield characteristics. Fifteen Pabna bulls having five in each age groups of 6 to12, 13 to 24 and 25 to 36 months were fed ad libitum mix silages of

Growth Performance and Nutrients Digestibility of Weaner Rabbits FED Diets Containing Par-Boiled and Non-Parboiled Rice Milling By-Products

“…Aside the effect of feed characteristics/quality on voluntary feed intake and utilization, the animal's environment has also been implicated on voluntary feed intake and utilization. This observation was in line with that of [19] who observed that, one of the factors affecting feed conversion is the temperature of an animal's environment. Animals perform optimally when there are minimal variations in environmental temperature over a 24-hour period of time [19].…”

“…This observation was in line with that of [19] who observed that, one of the factors affecting feed conversion is the temperature of an animal's environment. Animals perform optimally when there are minimal variations in environmental temperature over a 24-hour period of time [19]. According to them, on one hand, during cool weather conditions, animals will eat more feed but, much of the energy they obtain from the consumption of the feed is used to maintain body temperature and thus not converted into meat (weight) nor other productive functions [19].…”

“…There appears also to be age differences in the ability of the rabbits to utilize the feed consumed. This observation validates an earlier finding of [19] that, animals of higher live weight due to age differences required a higher amount of feed, even to attain a constant weight gain. Obviously, young and fastgrowing animals have a far more favorable FCR in the early fattening stage than when near slaughter weight.…”

“…Animals perform optimally when there are minimal variations in environmental temperature over a 24-hour period of time [19]. According to them, on one hand, during cool weather conditions, animals will eat more feed but, much of the energy they obtain from the consumption of the feed is used to maintain body temperature and thus not converted into meat (weight) nor other productive functions [19]. On the other hand, animals consume less feed and convert less efficiently at high environmental temperatures [19].…”

“…According to them, on one hand, during cool weather conditions, animals will eat more feed but, much of the energy they obtain from the consumption of the feed is used to maintain body temperature and thus not converted into meat (weight) nor other productive functions [19]. On the other hand, animals consume less feed and convert less efficiently at high environmental temperatures [19]. This biological cooling mechanisms that animals use during hot conditions require energy just as the warming mechanisms do during cool weather conditions.…”