论文部分内容阅读
为了研究大圆捆干草的热害,本文通过设制两个含水量(37％和24％)水平的大圆捆干草,分别设三个重复,将含水量为37％的草捆,中心部位温度高达56℃定为高温区,周围定为中温区。含水量为24％的草捆温度可达31℃,定为低温区,来探讨产热与干草化学成分和反刍动物利用之间的关系。研究表明,ADIN/T—N和NDIN/T—N值依低、中,高温区而依次增高,NDF和ADF含量依中、低、高温区而依次降低;粗蛋白可消化率在中、高温区比低温区还低,相反ADF和NDF的可消化率高;当给羊饲喂高温区干草时,粪氮量变大,尿氮排泄变少,然而保留氮在三个温区间差异不显著。
In order to study the thermal damage of large bale hay, we set up two bales of hay with water content (37% and 24%), set up three replications respectively, and set the bale with water content of 37% 56 ℃ as a high temperature zone, as the surrounding area for the temperature. The bales with a moisture content of 24% can reach temperatures of up to 31 ° C and are designated as low temperature zones to investigate the relationship between heat production and the chemical composition of hay and use of ruminants. The results showed that the ADIN / T-N and NDIN / T-N values increased in the order of low, medium and high temperature, while the content of NDF and ADF decreased in middle, low and high temperature areas. The digestibility of crude protein in medium and high temperature Compared with the low-temperature area, ADF and NDF had higher digestibility. When feeding high-temperature hay to the sheep, the amount of manure increased and the excretion of urine nitrogen decreased. However, the nitrogen retention was not significantly different among the three temperature ranges.