Effect of Additives N-Carbamylglutamate With Urea on Feed Intake and Daily Gain of Awassi Lambs

Abstract

This study was conducted to demonstrate the effect of four levels of N-carbamylglutamate (NCG), 0, 2, 4 and 6 g /day /animal with or without 1% urea on feed intake, daily and total gain. The experiment was conducted in animal field of the holy Abbasid shrine in Karbala from 10/14/2019 to 12/24/2019, experiment period was 70 days preceded by an adaptation period of 10 days, 32 female Awassi lambs aged 3-4 months were used with initial weight 23.725 ± 0.478 kg divided into two groups, each group has four treatments, first one fed four levels of NCG, 0, 2, 4 and 6 g / day without urea, while the second group was fed NCG, 0, 2, 4 and 6g/ day with 1% urea. Two-factor experiment (2 × 4) Completely Randomized Design was used for experimental treatments T1, T2, T3, T4, T5, T6, T7, T8. Results of adding NCG with or without replacing soybean meal with urea showed no significant differences in dry matter intake of roughage and concentrated feed, as well as, initial and final weight of the experimental animals (kg), in-vitro and in-vivo digestibility of dry matter, organic matter and nutrients (%). There were superiority of NCG treatments for feed efficiency compared to control, 12.63, 9.07, 8.66 and 8.81 for NCG treatments 0, 2, 4 and 6 g / day, respectively, and the efficiency of energy to daily gain, 0.42, 0.29, 0.27 and 0.27, respectively, and efficiency of crude protein intake /daily gain, 0.49, 0.33, 0.31 and 0.31 respectively, as well as the daily weight gain 90.89, 128.39, 132.5 and 131.07 (g /day) and total weight gain, 6.36, 8.99, 9.28 and 9.18 (kg) for NCG respectively. It can be concluded that urea can be substituted instead of soybean meal with addition NCG without negative effects on animal, as well as increasing feed efficiency, increasing daily gains and total weights, and improving the productive characteristics of Awassi lambs.

Effect of N- carbamylglutamate on amino acids and blood biochemistry in young male goats

“…The homeostasis of protein is very important for maintenance and production. Our results agreed with Mahdi (2020), who stated that no effects for adding NCG on total blood proteins in lambs. Zhang et al (2021) referred to decrease total protein and globulins with the low level of feeding and 20gm of arginine or 5gm/day of NCG for Hu ewes.…”

“…The deficiency of NAG causes hyperammonemia. In ruminants, NCG could be used with urea feeding without negative effects to improve the antioxidant capacity of the mother, fetus, placenta and to promote the growth of fetus and placenta during pregnancy (Zhang et al, 2016) growth and maintenance (Feng et al, 2018), controlling on blood urea, increasing feed efficiency to improve productive performance (Mahdi et al, 2021) and increases nitric oxide (NO) which works as a widening blood vessels, vasodilation and relaxation smooth muscle cells within the vessel walls (Wang et al, 2018). Researchers referred that NCG increases the endogenous synthesis of arginine (Wu et al, 2012) and arginine family amino acids like glutamine, glutamate, proline, ornithine, and citrulline.…”

Multifarious feed additives on lamb performance on Kuwait farms

“…The results are consistent with Mahdi et al . [ 47 ], stating that urea can be substituted instead of soybean meal with N-carbamylglutamate addition without negative effects on animals, and increasing feed efficiency, increasing daily gains and total weights, improving the productive features of Awassi lambs. The universal, non-protein nitrogen source used in ruminant feeding is urea, which is an inexpensive nitrogenous compound.…”

Influence of concentrate level with or without N- carbamylglutamate on rumen bacteria and fermentation characteristics of Shami goats

“…The results agreed with Carro et al [15], they noticed higher pH value with increasing roughages to concentrate 80:20%. The decrease pH with NCG due to pH value of NCG (2.6) [16]. The effect of concentrate feeding level with or without N-carbamylglutamate on rumen ammonia nitrogen referred to insignificant variations for rumen ammonia between different levels of concentrate at zero time (Table 3).…”