볏짚 및 가공처리 왕겨의 급여가 한우의 사료섭취 및 반추행동에 미치는 영향

Abstract

본 연구는 한우에 급여하는 저질 조사료 원 이 반추시간 및 빈도, 저작시간 및 저작빈도에 미치는 효과를 알아보기 위해 실시하였다. 시험사료는 농후사료 + 볏짚(50:50), 농후사료 + 볏짚 + 팽연왕겨(50:35:15), 농후사료+ 볏짚 + 분쇄왕겨(50:35:15)을 사용하였다. 농후사료 + 볏짚(50:50), 농후사료+ 볏짚 + 팽연왕겨(50:35:15) 및 농후사료+ 볏짚+분쇄왕겨(50:35:15)를 섭취한 한우의 사료섭취 및 반추시간은 각각 78.8과 338.4, 98.0과 362.5, 그리고 160과 519.2minld이었다. 벗짚의 30%를 팽연왕겨나 분쇄왕겨로 대체하였올 때 사료섭취 및 반추시간이 유의하게 증가하였으며 (p<0.05), 1일 반추시 총 저작횟수와 본당 저작횟수는 팽연왕겨와 분쇄왕겨를 급여하였올 때 유의하게 감소하였다(p<0.05). 또한 일일 총 반추식괴수와 반추분당 식괴수도 팽연왕겨와 분쇄왕겨를 급여할 때에 감소되었지만, 식괴당 저작시간과 저작횟수는 증가되었다(p<0.05). 이러한 결과는 볏짚과는 다른 물리척 폭성을 행연왕겨와 분쇄왕겨가 갖고 있고, 왕겨의 조사료적인 가치는 왕겨가 갖고 있는 물리척인 유효성에 의하여 반추위가 자극펀 결과에 의한 것으로 생각된다. Effects of low quality roughage sources on duration and frequencies of rumination and chewing in Hanwoo steers were determined, Animals were fed three diets; concentrate+rice straw(SO:SO), concentrate+ rice straw + popped rice hull(SO:3S: IS) and concentrate+ rice straw+ground rice hull(SO:3S: IS) to compare both rice straw alone and combination with rice hull. Eating and ruminating time of steers fed concentrate+ rice straw(SO:50), concentrate+ rice straw + popped rice hull(50:35:15) and concentrate + rice straw + ground rice hull(50:3S:15) were 78.8 and 338.4minlday; 98.0 and 362.5minlday, and 160 and 519.2min/day, respectively. When steers were fed popped rice hull and ground rice hull, time spent for both eating and ruminating was significantly increased(p <0.05). When steers fed popped and ground rice hull, number of ruminating chews and number of chews per rumination time were significantly decreased(p<0.05). The number of rumination boli and boli per rumination time had significantly decreased(p<0.05), but chewing time per boli, number of chew'S per bolus were significantly increased(p <O.OS) in steers fed both types of rice hull. In summary, when cattle were fed experimental diets substituted with popped or ground rice hull to rice straw, the rumination behaviors were increased, because popped or ground rice hull might physically stimulate rumen wall. Therefore, both the physically shape and size of roughage sources are important factors to induce rumination behavior.