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No.37 (1990/12) >

 
Title :沖縄肉用山羊の生産,第一胃内性状及びその肉質に及ぼす飼料の影響 : I. 第一胃内性状に与える青苅り野草の影響(畜産学科)
Title alternative :Study on Okinawan Meat Goat Production and Meat Quality as Influenced by Diets : I. Effect of Green Grasses on Rumen Characteristics (Department of Animal Science)
Authors :城間, 定夫
本郷, 富士弥
加行, 洋史
Authors alternative :Shiroma, Sadao
Hongo, Fujiya
Kagyo, Hirofumi
Issue Date :5-Dec-1990
Abstract :第一胃フィステルを装着した四頭の沖縄肉用山羊に三種類の飼料即ち,(1)青苅り野草,(2)アルファルファ乾草キュウブ(3)アルファファ乾草キューブ(70%)と市販乳牛用濃厚飼料(ペレット)を給与し,ルーメン内のpH,温度,生菌数,プロトゾア総数,プロトゾアの科及び亜科数,総揮発性脂肪酸量,各酸量及びその産生割合等の栄養生理諸元について比較検討した。現在沖縄の山羊飼養農家が普通に実施している飼い方に類似させるため,給与飼料のDCP及びTDN量は敢えて統一せず,NRCの標準に従い,体重の2.5%を給与した。青苅り野草は容積が大いため他の二種類の飼料に比べDCP及びTDNの摂取量が減少した。青苅り野草給与山羊の第一胃内温度は他の飼料区に比べて低かった。アルファルファ乾草に濃厚飼料を30%添加した場合,第一胃内pHは野草やアルファルファ乾草キューブのみの給与に比べて低く,生菌数,総プロトゾア数,Sprirotrichda,有尾及び無尾のEnto-diunium等の数,総VFA,酢酸,プロピオン酸,酪酸及びN-吉草酸等の量は逆に多かった。また,青苅り草給与山羊は生菌数と有尾のEntodiniumで中間値,Ophryoscolexで最高値を示したものの,総VFA量,酢酸,及びN-吉草酸では最低値であった。アルファルファ+濃厚飼料では酪酸比が最も高く,一方青苅り野草は我々の予期に反してプロピオン酸比が高かった。以上のことより,青苅り野草は濃厚飼料に比べて容積が大いためにDM,DCPやTDNの摂取量が抑制され,第一胃内の栄養諸元値が低くなった。従って,青苅り野草給与山羊は発育が悪く,屠殺年齢が遅れる分山羊が成熟しその刺身は味が酷く,山羊汁も美味で臭気の無い一因だと思われる。濃厚飼料給与山羊汁の臭気の一因として飼料中や第一胃内微生物の脂肪を構成する脂肪酸と共に第一胃内の高酪酸濃度の関与も考えられる。
Four fistulated crossbred Okinawan meat goats were fed (1) green grasses consisting of Paragrass, Napiergrass, Tachiawa Sendangusa and Noasagawo, (2) alfalfa hay cube (70%)+concentrate (30%, in the form of pellet) and (3) alfalfa hay cube to study their effects on physio-nutritional characteristics such as rumen pH, temperature, numbers of bacteria and protozoa and VFA production. When dry matter intake was limited to 2.5% of body weight acording to the NRC feeding standard, consumption of DCP in green grass fed goats was depressed as well as TDN and DE due to bulkiness of this diet. This seems to be the main factor attributable to the reported slower growth rate of meat goats fed green grasses only compared to those fed rations with concentrates. Rumen temperature was significantly lower in the goats fed green forage diet at each sampling time than those fed cube, and cube plus concentrate diets with no difference between the latter two diets. Compared to other two diets, feeding of alfalfa cube diet with concentrate resulted in lower pH with higher values in criteria such as numbers of live rumen bacteria, total protozoa, Spirotrichida, Entodiniums and concentrations of total VFA, acetic, propionic, butyric and n-valeric acids. Green grass fed goats, on the other hand, had intermediate figures in the number of Entodinium with tail and the highest value in Ophryoscolex, but were lowest in the concentrations of total VFA, acetic and n-valeric acids. Concerning with the proportion of individual VFA production, goats fed PC diet showed the highest fluctuation pattern in butyric acid. Contrary to our expectations, goats fed green grass deit gave the highest pattern in the proportion of propionic acid. From these results, it is suggested that feeding of green grasses to Okinawan meat goats without any protein or energy supplementation depresses intake of DM, DCP and TDN due to its bulky characteristic and results in lower values determined in this experiment. Therefore, as goats fed green grasses exclusively would grow slowly and their marketing ages are delayed,Sashimior sliced raw meat prepared from them becomes more tasty. In relation to offensive smell of soup prepared from goats fed ration containing concentrate, butyric acid may partly attributable as well as fatty acids from diet and those of microorganisms.
Type Local :紀要論文
ISSN :0370-4246
Publisher :琉球大学農学部
URI :http://hdl.handle.net/20.500.12000/3862
Citation :琉球大学農学部学術報告 = The Science Bulletin of the Faculty of Agriculture. University of the Ryukyus no.37 p.191 -201
Appears in Collections:No.37 (1990/12)

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