Webb Edward Cottington, Hassen Abubeker, Olaniyi Michael Olanrewaju, Pophiwa Pamela
Department of Animal Science, University of Pretoria, Hatfield, Pretoria 0028, South Africa.
Animals (Basel). 2022 Aug 11;12(16):2039. doi: 10.3390/ani12162039.
There is an increased interest in the use of medicinal plants as alternatives to antibiotic growth promoters and as agents for methane production mitigation. This study investigated the effects of Azadirachta indica and Moringa oleifera feed additives on the carcass and meat quality of lambs. Forty South African Mutton Merino lambs, weighing between 29 and 43 kg, were randomly assigned to four treatment groups (n = 10 lambs/treatment) and fed a basal total mixed ration (TMR) containing soybean meal (17%), yellow maize (28%), Alfalfa hay (20%), Eragrostis curvula hay (22.2%), molasses (6.0%), wheat offal (5%), urea (0.8%) and vitamin premix (0.5%) on a DM basis. The dietary treatments: TMR diet (control); TMR diet with A. indica leaf extract (A. indica leaf extract at a dosage of 50 mg per kg of feed: neem); TMR diet with M. oleifera leaf extract (M. oleifera leaf extract at a dosage of 50 mg per kg DM of feed: moringa); TMR diet with monensin (at a dosage of 50 mg monensin sodium per kg of feed: positive control). After an adaptation period of 10 days to the experimental conditions, the lambs from all treatment groups were fed ad libitum with the experimental diets. The lambs were slaughtered at a live weight of 60−65 kg after a 23 week trial period. The plant extract dietary additives had no significant effects on the carcass characteristics of the lambs. In comparison to monensin, supplementing with moringa leaf extracts resulted in a higher proportion of C18:1n9c (45.0% ± 0.57 vs. 40.5% ± 0.80; p < 0.05), total MUFAs (47.3% ± 0.66 vs. 42.6% ± 0.87; p < 0.05), and UFA:SFA ratio (1.01 ± 0.03 vs. 0.85 ± 0.03; p < 0.05), which may be beneficial for human health. Our results suggest that natural feed additives, such as A. indica and M. oleifera leaf extracts, can be included in lamb diets without compromising meat fatty acid composition. The negative economic impacts of such technologies on animal production and farm profitability should not be expected.
人们越来越关注将药用植物用作抗生素生长促进剂的替代品以及作为缓解甲烷产生的试剂。本研究调查了印楝和辣木叶提取物饲料添加剂对羔羊胴体和肉质的影响。四十只体重在29至43千克之间的南非肉用美利奴羔羊被随机分配到四个处理组（每组n = 10只羔羊），并以干物质计饲喂含豆粕（17%）、黄玉米（28%）、苜蓿干草（20%）、弯叶画眉草干草（22.2%）、糖蜜（6.0%）、小麦麸皮（5%）、尿素（0.8%）和维生素预混料（0.5%）的基础全混合日粮（TMR）。日粮处理：TMR日粮（对照）；含印楝叶提取物的TMR日粮（印楝叶提取物剂量为每千克饲料50毫克：印楝）；含辣木叶提取物的TMR日粮（辣木叶提取物剂量为每千克干物质饲料50毫克：辣木）；含莫能菌素的TMR日粮（莫能菌素钠剂量为每千克饲料50毫克：阳性对照）。在对实验条件适应10天后，所有处理组的羔羊自由采食实验日粮。在23周的试验期后，羔羊在体重60 - 65千克时屠宰。植物提取物饲料添加剂对羔羊的胴体特性没有显著影响。与莫能菌素相比，添加辣木叶提取物导致C18:1n9c比例更高（45.0% ± 0.可以包含在羔羊日粮中而不影响肉脂肪酸组成。不应预期此类技术会对动物生产和农场盈利能力产生负面经济影响。 057对40.5% ± 0.80；p < 0.05）、总单不饱和脂肪酸（47.3% ± 0.66对42.6% ± 0.87；p < 0.05）以及不饱和脂肪酸与饱和脂肪酸比例（1.01 ± 0.03对0.85 ± 0.03；p < 0.05），这可能对人类健康有益。我们的结果表明，天然饲料添加剂，如印楝和辣木叶提取物，
