ABSTRACT

Seven Swedish domestic goats (Capra hircus, 2–3 years) and their kids (37 ± 4 days) were subjected to indoor temperatures above 30°C during 15 days (periods H1–H4; periods without heat C1, C2) to study acclimation. Rectal temperature (RT) increased by 1.1°C during H1 to H3 (P < 0.001 vs. C1), but only by 0.6°C during H4 (P < 0.001 vs. C1; P < 0.024 vs. H1). Respiration rate (RR) increased less during H4 than during H1 (P < 0.001). Skin temperature increased during heat (P < 0.001), and skin evaporation (SE), which differed from C1 to H4 (P < 0.05). Goats increased water intake during heat, resulting in lowered milk osmolality while milk offtake was maintained. Kids' thermoregulatory responses resembled those of the goats. Thus, decreasing RT and RR simultaneously with increasing SE at the end of the heat indicate that goats had started to acclimate.

摘要

七只瑞典家养山羊（Capra hircus，2-3岁）和他们的孩子（37±4天）在15天内（H1-H4期间； C1，C2没热的时期）经受了高于30°C的室内温度研究。在H1至H3期间，直肠温度（RT）升高1.1°C（P <0.001 vs. C1），但在H4期间仅升高0.6°C（P <0.001 vs. C1; P <0.024 vs. H1）。H4期间的呼吸速率（RR）升高少于H1期间（P <0.001）。加热期间皮肤温度升高（P <0.001）和皮肤蒸发（SE），从C1到H4有所不同（P<0.05）。山羊在加热期间会增加饮水量，从而降低牛奶的渗透压，同时保持牛奶的摄入量。孩子们的体温调节反应类似于山羊。因此，在加热结束时降低RT和RR并同时增加SE表示山羊已经开始适应环境。