脂肪酸カルシウム塩のTDN含量

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タイトル別名
  • TDN Content of Calcium Salts of Fatty Acids
  • シボウサン カルシウムエン ノ TDN ガンリョウ

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Total 13 Holstein dry cows were used in 4 experiments to examine the effects of fatty acid composition, particle size, pelleting process and feeding level of calcium salts of fatty acids (CSFA) on the digestibility of acidified ether extracts (AEE) and TDN contents. In Expts 1 and 2, AEE digestibilities of CSFA made from palm oil and of a large or small particle size (PFA-L and PFA-S, respectively) were determined. Of the irregular type-particles of PFA-L, about 45% was over 2mm mesh, while about 85% was under 2mm mesh in case of PFA-S. In each experiment, 0 or 400g CSFA was daily added to a basal diet, and AEE digestibilities were estimated from the difference in daily fecal excretions of AEE divided by the daily AEE intake as CSFA. The values thus obtained were 84.0% with PFA-L and 94.3% with PFA-S. In Expt 3, the AEE digestibility of PFA-SP, which was prepared by processing PFA-S into a pellet of 5mm in diameter, was estimated in a similar manner, resulting in the value of 98.0%. Expt 4 was conducted to examine AEE digestibilities of CSFA made from tallow (TFA-L), of which particles about 39% was over 2mm mesh, at two feeding levels of 200 and 400g/d, resulting in the values of 76.7 and 66.1%, respectively. Using the AEE content of each CSFA as a basis of calculation, TDN contents of PFA-L, PFA-S, PFA-SP and TFA-L at 400g/d were 158, 178, 179 and 126%, respectively. The present results suggest that the TDN content of CSFA could be affected by particle size as well as by fatty acid composition, but not depressed by pelleting process. The feeding level may also affect the TDN content, but the AEE digestibilities of PFA-S and PFA-SP at 400g/d were so high that the influence appears to be less when fatty acids are of composition similar to palm oil.

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