Studies on the Metabolic Energy Saving Characteristics in Swamp Buffaloes.

从水牛、荷尔斯泰牛和婆罗曼-泰国本地杂交后代中分离出心脏和肺，并比较了它们的解剖特征。尽管荷尔斯泰牛的体重明显高于水牛或婆罗曼-泰国本地杂交牛，但在心脏/体重(%)和肺/体重(%)方面，水牛的比例明显高于荷尔斯泰牛或婆罗曼-泰国本地杂交牛。水牛和婆罗曼-泰国本地杂交的肺重/心脏重量比率没有显著差异，而荷尔斯泰牛的这一比率显著低于水牛或婆罗门-泰国本地杂交。在解剖学上，水牛的主动脉弓既厚又大，荷尔斯泰牛的主动脉弓薄而大，婆罗曼-泰国本地杂交牛的主动脉弓小。虽然心脏的总体形状相似，但水牛心脏中的肌肉分布被发现有很大的不同，Holsteins an…更多的d梵天-泰国土生土长的十字架。尽管心脏大小不同，但腹侧和背侧乳头肌之间的大小保持恒定的平衡。通过给予自主神经阻滞剂，比较了沼泽水牛和黄牛的内在心率和自主神经张力。水牛的静息心率显著低于牛(平均S.E.：49.5 1.2次/分钟对62.0 1.4次/分钟)。此外，水牛的内在心率显著低于黄牛(56.2；+-gt；1.8vs76.7&lt；+-gt；3.1次/分钟)。另一方面，从服用阻滞剂前后记录的心率变化计算出的净自主神经音调在两种动物中都显示出副交感神经占优势的类型，水牛的绝对值小于牛(-9.0；正负；gt；7.3vs-21.3&lt；正负5.1%)。根据这些结果，我们认为，在水牛身上观察到的较低的静息心率可能是由于较低的内在心率，而不是副交感神经的抑制作用。

Hearts and lungs were isolated from buffaloes, Holsteins and Brahman-Thai native crosses and was their anatomical characteristics compared. Even though the body weight was significantly heavier in Holsteins than in buffaloes or in Brahman-Thai native crosses, in terms of heart/body weight (%) and lung/body weight (%), buffaloes showed a significantly higher percentage than the Holsteins or the Brahman-Thai native crosses. No significant difference was found in the lung weight/heart weight ratio between buffaloes and Brahman-Thai native crosses, whereas the ratio was significantly lower in Holsteins than in either buffaloes or Brahman-Thai native crosses. The arch of the aorta could be anatomically characterized as being thick and large in buffaloes, thin but large in Holsteins and small in Brahman-Thai native crosses, respectively. Although the general shape of the heart was similar, muscular distribution in the heart was found to be considerably different among buffaloes, Holsteins an … More d Brahman-Thai native crosses. A constant balance in size between ventral and dosal papillary muscles was observed in spite of the difference in cardiac size.Intrinsic heart rate and autonomic nervous tone in swamp buffaloes were compared with those in cattle by the administration of autonomic blockers. Resting heart rate was significantly lower in buffaloes than in cattle (mean S. E. ; 49.5 1.2 vs 62.0 1.4 beats/min.). Furthermore, buffaloes showed a significantly lower intrinsic heart rate than cattle (56.2<plus-minus>1.8 vs 76.7<plus-minus>3.1 beats/min.). On the other hand, the net autonomic tone calculated from the changes in heart beats recorded before and after the administration of the blockers showed a parasympathetic-predominant type in both species, with the absolute value being smaller in buffaloes than in cattle (-9.0<plus-minus>7.3 vs -21.3<plus-minus>5.1%). On the basis of the results obtained, it is suggested that lower resting heart rate observed in buffaloes may be due to the lower intrinsic heart rate rather than to be inhibitoryeffect of the parasympathetic nervous Less