摘要
Four crossbred Sindhi heifers with an average body weight (BW) of 135 kg and a mean age of 17 months were used to investigate the effect of feeding different combinations of rice straw and ensiled water hyacinth (EWH) supplemented with a source of protein in the form of cottonseed cake (CSC) on intake and digestibility. Four treatments consisting of graded levels of EWH were arranged in a Latin square. The levels of EWH were set at: 0 (EWH0), 15 (EWH15), 30 (EWH30), and 45% (EWH45) of an expected total dietary dry matter (DM) intake of 30 g total DM per kg BW per day. Rice straw was offered ad libitum, while CSC was given at a fixed level of 5 g DM/kg body weight (BW). Voluntary intake and digestibility were measured consecutively in the 4 experimental periods which each lasted 28 days. The crude protein (CP) content of EWH, rice straw and CSC were 174, 53 and 370 g/kg DM, respectively. Rice straw had the highest neutral detergent fibre (NDFom) content (666 g/kg DM), followed by EWH (503 g/kg DM) and the lowest content was 418 g/kg DM in the CSC. The actual EWH contents in the consumed diets were 0, 17, 32 and 52% for EWH0, EWH15, EWH30 and EWH45, respectively. Rice straw intake decreased with level of EWH offered from 3049 for EWH0 to 1014 g/day for EWH45. Crude protein intake was 16, 25 and 33% higher (p<0.001) in EWH15, EWH30 and EWH45 treatments, respectively, as compared to EWH0. Digestibility of organic matter (OM), CP, NDFom and acid detergent fibre (ADFom) increased with increasing level of EWH offered. The highest OM digestibility (72.2%) was found for treatment EWH45 and the lowest (47.4%) for treatment EWH0. In spite of similar dietary CP contents, CP digestibility increased by 21 (EWH15), 31 (EWH30) and 40% (EWH45) with increasing level of EWH in comparison with treatment EWH0. It is concluded that increasing level of EWH in cattle diets considerably improved CP intake and digestibility of nutrients.
摘要译文
饲喂不同组合的稻草和青贮水葫芦（EWH）对棉籽饼（CSC）形式的蛋白质来源的摄入和消化率的影响。在拉丁方中安排了四种由等级EWH组成的治疗方法。 EWH水平设定为：0（EWH0），15（EWH15），30（EWH30），和45％（EWH45）的预期总膳食干物质（DM）摄入量为每天每公斤体重30克。随意提供稻草，而CSC的固定水平为5克DM / kg体重（BW）。在4个实验期间连续测量自愿摄入和消化率，每个实验期持续28天。EWH，稻草和CSC的粗蛋白（CP）含量分别为174,53和370 g / kg DM。稻草具有最高的中性洗涤纤维（NDFom）含量（666 g / kg DM），然后是EWH（503g / kg DM），CSC中最低含量为418g / kg DM。对于EWH0，EWH15，EWH30和EWH45，消耗的饮食中的实际EWH含量分别为0％，17％，32％和52％。稻草摄入量随EWH水平的下降而降低，EWH0为3049，EWH45为1014克/天。在EWH15，EWH30和EWH45处理中，粗蛋白质摄入量分别高出16％，25％和33％（p 0.001），分别与EWH0相比。有机物（OM），CP，NDFom和酸性洗涤纤维（ADFom）的消化率随着提供的EWH水平的增加而增加。最高的OM消化率（72。发现2％）用于治疗EWH45，最低（47.4％）用于治疗EWH0。尽管饮食中CP含量相似，但CP消化率增加了21（EWH15），与治疗EWH0相比，EWH水平增加31（EWH30）和40％（EWH45）。结论是，增加牛日粮中的EWH水平可显着提高CP摄入量和营养素的消化率。
Tham, Ho Thanh; Uden, Peter;. Effect of Water Hyacinth (Eichhornia Crassipes) Silage on Intake and Nutrient Digestibility in Cattle Fed Rice Straw and Cottonseed Cake[J]. Asian-Australasian Journal of Animal Sciences, 2013,26(5): 646-653