Abstract
This study was conducted to investigate the dry matter intake, weight gain and the required area of grazing pasture for dairy goats. The experimental trials were conducted from April, 2007 to June, 2008 at the animal experimental station in Chungnam National University. The seed mixtures of grazing pasture were composed of orchardgrass (40%) + tall fescue (20%) + perennial ryegrass (10%) + alfalfa (15%) + red clover (15%). The grazing area was $5,000\;m^2$ which was composed of 4 paddocks (average $1,250\;m^2$/plot) and the goats were grazed twelve times by a rotational grazing system. The dairy goats (Saanen) were selected which had nearly the same body weight (average 31.1kg). The average chemical composition of herbage of mixture in grazing periods was crude protein (20.4%), NDF (65.3%) and ADF (31.1%) respectively and the in vitro dry matter digestibility was 68.9%. The average dry matter intake amount per head was 1.253 kg, and the intake amount per body weight was 3.01%. The average body weight gain during the grazing periods (184 days) was 17.4 kg, and the daily gain was 98 g. The required area of grazing pasture was calculated at $467.7\;m^2$ a dairy goat (weight 50 kg basis). This figure, being converted into animal unit (AU), corresponded to approximately 2.14 AU/ha.
본 연구는 혼파초지에서 유 산양을 방목 이용하였을 때의 건물섭취량, 증체량 및 두당 방목초지의 소요면적을 산출하고자 2007년 4월부터 2008년 6월까지 충남대학교 동물사육장내 혼파초지에서 수행하였다. 공시초지는 2006년 9월 21일 orchardgrass (40%) + tall fescue (20%) + perennial ryegrass (10%) + alfalfa (15%) + red clover (15%)를 ha당 30 kg 파종하여 경운초지로 조성한 혼파초지에서 수행하였다. 방목면적은 총 $5,000\;m^2$로 4목구(구당 평균 $1,250\;m^2$)의 윤환 방목으로 12회 방목하였다. 공시축은 Saanen종으로 13두(평균 31.1 kg)를 방목하였다. 방목기간 중 월 별로 조사한 혼파초지의 평균 조단백질 함량은 20.4%, NDF와 ADF 함량은 각각 65.3%와 31.1%이었으며, 건물소화율은 68.9%이었다. 두당 평균 건물섭취량은 1.253 kg 이었으며, 체중 당 3.01%을 섭취하였다. 방목기간 (184일)의 두당 평균 증체량은 17.4 kg이었고, 일당증체량은 98g이었다. 유 산양(체중 50 kg 기준)의 두당 방목초지의 소요면적은 $467.7\;m^2$로 산출되었는데 이를 Animal unit (AU/ha)로 환산하면 약 2.14 AU/ha에 해당하였다.
