Department of Animal Production, Faculty of Agriculture, Mansoura University, Mansoura, 35516, Egypt.
Department of Animal Nutrition Research, Animal Production Research Institute, Agricultural Research Center, Dokki, 12619, Giza, Egypt.
Trop Anim Health Prod. 2023 Feb 1;55(1):59. doi: 10.1007/s11250-023-03462-1.
Consuming saline water causes animals salinity stress, which leads to many adapting metabolic changes that could negatively affect its performance and the quality of the derived products. Therefore, this study aimed to evaluate the impact of increasing diet protein level on the productive performance of growing lambs drinking natural saline water in Egyptian semi-arid region. Twenty-four growing Barki lambs (4-5 months old) with an initial body weight of 20.7 ± 0.25 kg were randomly distributed into four similar groups for 150 days. Two diets were formulated: low protein and high protein levels (concentrate feed mixture containing 14% and 20% crude protein (CP) on dry matter basis, respectively). Within each level of CP, natural saline water was represented by low saline (LS) and high saline (HS) water, containing 658 and 2100 mg/L of total dissolved solids, respectively. Results showed that the HS water increased (p = 0.02) water intake by about 18% and had adverse effect (p < 0.001) on dry matter intake, nutrient digestibility, and growth performance. The ruminal pH values, total volatile fatty acids, and ammonia-N concentrations were not affected by drinking the HS water. However, the protein supplementation enhanced the HS lambs' nutrients digestion and showed greater growth performance. The HS water decreased (p < 0.001) the serum concentrations of alanine aminotransferase (ALT) and aspartate aminotransferase (AST) and increased (p = 0.03) the urea-N by about 9%. The protein supplementation amended the serum ALT and AST concentrations of HS lambs. It is concluded that the dietary protein supply was affective sustainable management strategy against the deleterious effect of drinking high saline water on growing lambs.
饮用盐水会导致动物产生盐度应激，这会导致许多适应性代谢变化，从而对其性能和衍生产品的质量产生负面影响。因此，本研究旨在评估增加日粮蛋白水平对在埃及半干旱地区饮用天然盐水的生长羔羊生产性能的影响。将 24 只生长巴克里羔羊（4-5 月龄）随机分为 4 个相似组，每组 6 只，初始体重为 20.7±0.25kg，试验期为 150 天。设计了两种日粮：低蛋白和高蛋白水平（浓缩饲料混合物分别含有 14%和 20%粗蛋白（CP），干物质基础）。在每个 CP 水平内，低盐水（LS）和高盐水（HS）分别代表天然盐水，其总溶解固体含量分别为 658 和 2100mg/L。结果表明，HS 水增加了（p=0.02）羔羊的饮水量约 18%，并对干物质采食量、养分消化率和生长性能产生不利影响（p<0.001）。HS 水对瘤胃 pH 值、总挥发性脂肪酸和氨氮浓度没有影响。然而，蛋白质补充提高了 HS 羔羊的养分消化率，表现出更好的生长性能。HS 水降低了（p<0.001）血清丙氨酸转氨酶（ALT）和天冬氨酸转氨酶（AST）浓度，并使尿素氮增加了约 9%（p=0.03）。蛋白质补充改善了 HS 羔羊的血清 ALT 和 AST 浓度。研究结论认为，日粮蛋白质供应是一种有效的可持续管理策略，可以减轻饮用高盐水对生长羔羊的不利影响。
