同一飼料を与えたトカラ種山羊とサフォーク種めん羊の消化率の比較

Abstract

A comparison of digestion was made between Japanese native Tokara buck kids (Tokara) and Suffolk ram lambs (Suffolk) fed alfalfa hay cube digestion trial, orchardgrass hay digestion trial and mixed feed trial consisting of 4 parts rice straw to 3 parts of wheat bran (rice straw. wheat bran digestion trial) for the purpose of ascertaining the digestible performance of each feed, respectively. In this experiment, the same four Tokara and the same four Suffolk lambs were used, respectively, aged five to seven months. The experimental feeds were adjusted to supply a no refusal, and also the amounts were the same per metabolic body size for each of the digestion trials. The results were as follows : (1) The digestibility coefficients in percentages for all components of the experimental feeds were lower in the Tokara than in the Suffolk except for crude protein and nitrogen free extracts in the alfalfa hay cube digestion trial.(2) Components showing significant differences were crude fiber, acid detergent fiber and neutral detergent fiber in all digestion trials. In addition to this, components demonstrating significant differences were dry matter and gross energy in the alfalfa hay cube digestion trial, dry matter, crude fat and gross energy in the orchardgrass hay trial, and crude fat in the rice straw. wheat bran digestion trial, respectively.(3) The nutritive values per dry matter were lower for total digestible nutrients and digestible energy in the Tokara than in the Suffolk in all of the digestion trials, but the orchardgrass hay digestion trial alone showed significant differences.(4) Digestible crude protein per dry matter was similar for the Tokara and the Suffolk. They were not significant in any digestion trial.(5) Nitrogen balance was similar for the Tokara and the Suffolk in all digestion trials.(6) Relative to the Suffolk, it was concluded that the apparent digestibility of feed for the Tokara was low, especially of fibrous components.