Production and thermal comfort of Nellore beef cattle finished in integrated crop-livestock systems

ABSTRACT The objective of this work was to evaluate pasture, performace, thermal comfort, and haematological parameters of Nellore cattle in the finishing phase in integrated crop-livestock systems with two tree densities (ICLF-1L= 196 ha -1 trees and ICLF-3L= 448 ha -1 trees) and in full sun (ICL). The forage mass morphological composition of the pasture average daily gain, weight gain per area, stocking rate of the animals were evaluated in summer and autumn, and the climatic variables of systems we evaluated at three different times, and haematological parameters of the animals (n= 60). The forage mass was higher in the ICL treatment and summer (P0.05). Ambient temperature, globe temperature and temperature and humidity index were better in shade treatments and in the morning, providing greater comfort to the animals, and was also confirmed by the lower globular volume of the bovines in ICL (P

摘要：本研究旨在评估两种林木密度的农牧复合系统（ICLF-1L=每公顷196株，ICLF-3L=每公顷448株）及全光照系统（ICL）中，育肥期内洛尔牛（Nellore cattle）的牧场饲草状况、生产性能、热舒适程度及血液学参数。本研究于夏季和秋季开展指标测定，涵盖牧场饲草生物量的形态组成、家畜平均日增重、单位面积增重与载畜率；同时在三个不同时段监测各系统的气候变量，并对60头试验牛的血液学参数进行检测。全光照（ICL）处理组与夏季的饲草生物量更高（P0.05）。环境温度、黑球温度及温湿度指数在遮阴处理组与晨间时段表现更优，可为家畜提供更优良的热舒适条件，该结论也通过ICL组牛的较低球状血细胞容积得到验证（P