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首页> 外文期刊>Tropical Animal Health and Production >Effects of urea treatment of straw and dietary level of vegetable oil on lactating dairy cows
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Effects of urea treatment of straw and dietary level of vegetable oil on lactating dairy cows

机译：秸秆尿素处理和日粮植物油水平对泌乳奶牛的影响

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Four crossbreds (75% Holstein Friesian) lactating dairy cows were used to evaluate the effects of sunflower oil (SFO) levels and roughage source on feed intake, nutrient digestibility, ruminal fermentation, milk yield, and milk composition. Four milking cows with average liveweight of 410 ± 25 kg and 18 ± 11 days in milk were randomly assigned according to a 4 × 4 Latin square design, in a 2 × 2 factorial arrangement, with SFO levels (3% or 6%) in the concentrate and the roughage source [rice straw (RS) or urea-treated RS (UTRS)] being the main factors. Four dietary treatments as (1) 3% SFO + RS, (2) 6% SFO + RS, (3) 3% SFO + UTRS, and (4) 6% SFO + UTRS were offered ad libitum total mixed ration, with a concentrate/roughage ratio of 60:40. The results were found that UTRS as a roughage source significantly increased feed intake, digestibility, concentration of acetic acid in rumen fluid, rumen ammonia–nitrogen, blood–urea nitrogen, milk urea–nitrogen, and milk yield (3.5% fat-corrected milk) compared with cows fed on untreated RS. Supplementation of SFO at 3% in the concentrate-supplemented group having increased dry matter intake, milk fat percentage, and milk yield (3.5% fat-corrected milk) compared with 6% SFO supplementation. However, there were no interaction effects between level of SFO in the concentrate and roughage source in any of the factors studied.
机译：使用四头杂种（75％的荷斯坦奶牛）泌乳奶牛来评估葵花籽油（SFO）水平和粗饲料来源对饲料摄入，养分消化率，瘤胃发酵，产奶量和奶成分的影响。根据4×4拉丁方设计，以2×2析因排列，随机分配4头平均活重为410±25公斤，乳汁为18±11天的挤奶牛，其SFO水平（3％或6％）在母猪中。精矿和粗饲料的来源[稻草（RS）或尿素处理的RS（UTRS）]是主要因素。随意提供四种饮食疗法，分别为（1）3％SFO + RS，（2）6％SFO + RS，（3）3％SFO + UTRS和（4）6％SFO + UTRS，其中精矿/粗矿比率为60:40。结果发现，作为粗饲料的UTRS显着提高了饲料摄入量，消化率，瘤胃液中乙酸的浓度，瘤胃氨氮，血液尿素氮，牛奶尿素氮和牛奶产量（3.5％校正脂肪的牛奶） ）与未经处理的RS饲喂的母牛相比。与添加6％SFO相比，在补充浓缩液的组中，添加3％的SFO具有增加的干物质摄入量，乳脂百分比和产奶量（3.5％的脂肪校正乳）。但是，在所研究的任何因素中，精矿中SFO含量与粗饲料来源之间均没有相互作用。

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