Korean Journal of Organic Agriculture (한국유기농업학회지)

Korean Association of Organic Agriculture (한국유기농업학회)
권호 표지

Effects of Organic Feed Containing Rice Bran and Soybean Hull on Milk Production of Mid-Lactation Dairy Goats

미강과 대두피가 첨가된 유기사료의 공급이 비유중기 유산양의 유생산성에 미치는 영향

  • 박중국 (농촌진흥청 국립축산과학원) ;
  • 김창현 (한경대학교 동물생명환경과학부)
  • Received : 2010.08.26
  • Accepted : 2010.10.18
  • Published : 2010.12.31
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Abstract

This study was conducted to investigate the effect of organic feed containing rice bran and soybean hull as organic by-products on milk production of mid-lactation dairy goats. Four Saanen dairy goats (initial BW $59.4{\pm}7.4$ kg, average 6 lactation months, fourth kidding) were allocated into conventional feed group (T1) and organic feed group (T2) with 2${\times}$3 crossover design for 9 weeks. Experimental diets were formulated to contain 23 MJ ME/d, 382 g CP/d DM based on NRC (1981) and AFRC (1998). Dry matter (DM) intakes of concentrate and silage were higher in T2 (1,232 and 96 g/d) than T1 (1,105 and 91 g/d) (p<0.05). However, DM intake of hay was higher in T1 (488 g) than T2 (347 g) (p<0.05). Total DM intake had no significant difference between T1 and T2. Although no significant difference was found in milk yield between treatments, T2 numerically increased (+150 g/d) compared with T1. There were no significant differences in milk composition and milk urea nitrogen (MUN) between T1 and T2. Relative to T1, T2 significantly increased the stearic acid (C18:0) and linoleic acid (C18:2) (p<0.05). Overall results of the present experiment indicated that organic feed could not adversely affect DM intake and milk production in dairy goats compared with conventional feed.

본 연구는 유기곡물사료와 농산가공부산물인 미강과 대두피를 이용한 유기배합사료를 제조하였으며, 관행사료와 비교하여 산양유의 생산성 및 경제성에 미치는 영향을 조사하기 위함이다. Saanen종 비유중기 4두를 유량, 착유일수 및 산차수를 고려하여 배치하였으며, 시험 설계는 2${\times}$3 crossover design으로 하였으며, 2주간 예비기간을 거쳐 본 시험을 실시하였다. 사료공급은 에너지 및 단백질 공급량에서 ME가 23 MJ/d, 그리고 CP는 382 g/d가 되도록 조정하였다. 전체 건물섭취량은 T1구(관행사료)와 T2구(유기사료)에서 각각 1,633g과 1,658g으로 비슷한 섭취량을 나타냈으며, 유량에서는 유의한 차이는 없었지만, T2구에서 1,816g/d로 T1구의 1,667g/d와 비교하여 약 150g/d 높은 유량 증가를 나타냈다. 유성분과 유지방 함량에서는 처리간 차이를 나타내지 않았으나, 지방산조성은 사료내 불포화지방산 함량이 풍부한 T2구에서 T1구보다 stearic acid(C18:0)와 linoleic acid(C18:2)가 유의하게 높았다. 또한 경제성 평가에서 1마리당 하루 150원의 소득증가를 나타냈으며 결과적으로 유기사료를 급여함으로써 농가소득에 기여할 것으로 판단된다.

Keywords

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