고온스트레스 하에서 한우 번식우의 유지를 위한영양소 요구량 설정에 관한 연구
A Study on Establishment of Nutrient Requirement for Maintenance of Hanwoo Cow under Heat Stress
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본 연구는 지구온난화 시 예상되는 고온기를 대비하여 고온 및 사료 에너지 급여 수준이 한우 번식우영양소 소화율에 미치는 영향을 규명하고 고온 스트레스 시 한우 번식우의 영양소 요구량을 설정하고자수행하였다. 시험은 한우 번식우 4두(평균체중 491±85.6kg)를 공시하였고, 시험구는 고온 및 사료에너지 급여 수준에 따라 4 시험구(한국가축사양표준 한우 번식우 유지요구량 TDN의 100%(대조구),고온 처리 및 TDN 100%(T100), TDN 115%(T115), TDN 130%(T130))로 나누어 개체별 대사케이지에4×4 Latin square design으로 배치하여, 각 period당 21일씩 대사시험을 실시하였다. 대조구는 온도24℃, 습도 60%(온습도지수(THI)=71.46), 나머지 3개 처리구는 온도 30℃, 습도 70%(THI=81.38)로설정하였다. 외관상 건물소화율은 대조구와 T100구가 각각 81.64와 81.39%로 T115(78.23%),T130구(78.15%)보다 유의적으로 높게 나타났다(p<0.05). 대조구 대비 혈중 thyroxine, glucose 및BUN 함량은 T100구에서 수치적 감소가 나타났으나 T115 및 T130구에서 다시 증가하는 결과가나타났다. 고온처리구의 일당증체량을 기준으로 한우 번식우 유지를 위한 TDN 요구량 산정식(Y=0.2097X+111.2428)을 도출하였고, 이는 지구온난화(고온기) 시 유지를 위한 한우 번식우 TDN요구량은 현재 한국가축사양표준에서 제시된 요구량 대비, 11.24%를 증량 급여해야 함을 의미한다.
Abstract
This study was carried out to establish nutrient requirements for maintenance of Hanwoo cowunder heat stress against global warming. Four Hanwoo cows weighing 491±85.6kg in 4×4 Latinsquare design were fed four different energy level diets; 100%(control), 100%(T100),115%(T115) and 130%(T130) of TDN(Total digestible nutrients) levels of Hanwoo cows basedon Korea Feeding Standard for Hanwoo using rice straw and commercial concentrate. The cowin the control was housed with no stress(temperature 24℃ and humidity 60%), whereas thecows in the other groups were under 30℃ in temperature and 70% in humidity. Each periodlasted 21days including 4days as a sampling period. Apparent digestibility of dry matter wassignificantly(p<0.05) higher in control(81.64%) and T100(81.39%) than T115(78.23%) and T130(78.15%). Compared with control, numerically lower blood thyroxine, glucose and BUNconcentrations appeared in the T100. Average daily gain(ADG) for T100(-56.00g) wassignificantly(p<0.05) lower than control(-31.25g), T115(35.50g) and T130(77.25g), respectively. Based on ADG among the treated groups, the equation(Y=0.2097X+111.2428) of TDNrequirement of Hanwoo cow for maintenance was calculated, indicating that 11.24% TDN formaintenance of Hanwoo cows under high temperature condition may additionally be supplied.
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