중조 및 액상형 완충제 급여가 홀스타인 젖소의 산유량, 유성분 및 혈액성상에 미치는 영향
The effect of Sodium Bicarbonate and Liquid Buffer on Milk Yield, Milk Composition and Blood Metabolites of Holstein Dairy Cows
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반추위 pH 조정제로서 일반적으로 중조가 많이 사용되고 있으나 사료에 중조의 첨가량을 증가시키는경우에 기호성을 저하시키는 경향이 있다. 따라서 본 연구에서는 사료의 기호성에 영향을 미치지 않으면서 반추위 완충효과를 나타내도록 개발된 액상형 완충제의 젖소사료 첨가제로서의 이용효과를 구명하기 위하여 수행되었다. 시험축으로 착유 중기 젖소 27두를 공시하였으며, 처리는 대조구와 중조 첨가구, 그리고 액상형 완충제 첨가구로 하여 처리별 9두씩 배치하였다. 대조구는 착유우용 자가배합 TMR사료를 급여하였으며, 중조 첨가구는 대조 사료에 중조를 두당 1일 150g 추가하여 급여하였고, 액상형완충제 첨가구는 같은 방식으로 액상형 완충제를 두당 15㎖ 추가하여 사양시험을 수행하였다. 시험결과산유량은 대조구, 중조 및 액상형 완충제 첨가구의 경우에 각각 23.82, 23.91, 24.91kg으로 대조구에비하여 액상형 완충제 처리구에서 다소 증가하는 경향이었으나 처리 간에 뚜렷한 유의 있는 결과를 보여주지는 않았다. 처리에 따른 유성분 변화에서는 유단백질 및 무지고형분에서 액상형 완충제를 첨가한경우에 대조구에 비해 유의 있는 증가(p < 0.05)를 보여주었고, 유지율에서도 대조구에 비하여 처리구가 다소 증가하는 경향을 보였다. 혈액성분 중 포도당과 콜레스테롤은 대조구에 비해 액상형 완충제의첨가구에서 다소 증가하였으나, 처리 간에 유의 있는 차이를 나타내지는 않았다. 따라서 개발된 액상형완충제의 추가급여 시 생산성 증대, 특히 유성분 증가 효과가 있어 반추위 pH 조정을 위하여 일반적으로 이용되고 있는 중조를 대체하여 반추동물의 사료첨가제로 이용이 가능할 것으로 평가되었다.
Abstract
Sodium bicarbonate has been widely utilized as a rumen pH buffer yet they tend to decreasepalatability in parallel with the amount added in feed. In the current study, therefore weinvestigated effects of use of the liquid buffer as a cow feed additive which was designed to elicitbuffering effects on rumen pH without compromising the palatability of feeds. A total of twentyseven mid-lactation dairy cows were included and then assigned into either 1) the control group,2) the sodium bicarbonate group, or 3) the liquid buffer group (n = 9 per each group). For thecontrol group, cows were fed with self-formulated TMR (Total Mixed Ration) for lactating cows while sodium bicarbonate (150 g sodium bicarbonate/cow/day) and liquid buffer (15 mL liquid buffer/cow/day) were fortified into the control diet for the sodium bicarbonate group and the liquidbuffer group, respectively. In the results of feeding experiment, the milk yields of the controlgroup, sodium bicarbonate group, and liquid buffer group were found to be 23.82, 23.91, and24.91 kg, respectively; although there was a trend toward increase in the milk yield of the liquidbuffer group, no statistical significance was noted. When it comes to the milk composition, therewere significant differences in milk protein and non-fat milk solids in the group treated with theliquid buffer compared to those of the control group (p < 0.05). Compared to the control group,the blood levels of glucose and cholesterols were slightly elevated by the liquid buffer treatmentbut no statistical significance was found amongst treatments. Taken together, we demonstrated thatfortification of the liquid buffer proposed herein increased productivity, the milk composition inparticular, hence might be utilized as a feed additive for ruminants in order to replace sodiumbicarbonate conventionally used for rumen pH buffer.
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