Effects of dietary energy density on nutrient digestibility, performance and carcass characteristics of Morada Nova lambs

Abstract

The trial was conducted with 48 Morada Nova lambs to evaluate the effects of different levels of metabolizable energy (ME) on nutrient digestibility and carcass characteristics. The animals were noncastrated and 2 months of age, with initial body weight (BW) averaging 12.05 ± 1.81 kg. The animals were assigned to a randomized block design with eight replications per block and five diets with increasing levels of metabolizable energy (0.96, 1.28, 1.72, 2.18 and 2.62 Mcal/kg DM). Animals were weighed weekly to calculate the average daily gain (ADG). When the BW mean for a particular dietary treatment reached 25 kg, the animals were slaughtered. Linear effect was observed for digestibility coefficient of DM, OM, EE, CP, NDF, TC, FC and NFC. The ADG presented linear increase (P<0.0001) with ME levels. The highest ADG observed was 135.98 g/day for the level of 2.62 Mcal/kg DM. The hot carcass weight, cold carcass weight, loss by cooling in kilogram and biological yield did not vary in function of ME levels with average values of 11.52; 11.03; 0.48 and 57.25, respectively. It was concluded that the incresead level of dietary energy influences nutrient digestibility and average daily gain of Morada Nova lambs during the growing period, without changing carcass traits.

Effect of Different Energy Levels on Growth, Carcass Traits , Body Composition and Digestibility of Nutrient in Awassi Lambs

“…This increase of total digestible nutrient is due to the increased digestibility of crude protein, crude fiber, ether extract and nitrogen free extract by increasing energy level. These results agree with those found by Costa (11) on Morda nova lamb and Sayed (30) on Sheep.…”

Biometria testicular de ovinos Pantaneiros alimentados com níveis crescentes de glicerina bruta na dieta

“…Para Raji et al (2008), em seu experimento, comprovam que esta correlação está totalmente ligada ao crescimento e desenvolvimento reprodutivo do animal, porém caso ocorra quaisquer alteração a nível celular pelos componentes da dieta, como degeneração e posterior diminuição do crescimento celular nos testículos, existiria decréscimo do desenvolvimento testicular. Houve moderada correlação entre o PCQ e a EGC, isto pode se dar devido à presença de gordura estar relacionada à formação e composição geral da carcaça, explicado por Costa et al (2013).…”