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여름철 γ-aminobutyric acid 급여가 산란계 폐사율에 미치는 영향

Effects of γ-aminobutyric Acid on Mortality in Laying Hens During Summer Time

최양호
농업생명과학연구원 (Institute of Agriculture & Life Science, Gyeongsang National University)|2019|농업생명과학연구 (Journal of Agriculture & Life Science)|제53권 제2호|pp. 131-139|DOI https://doi.org/10.14397/jals.2019.53.2.131

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키워드

Mortality폐사율Heat stressLaying hens산란계고온스트레스난중Egg weightγ-aminobutyric acid (GABA)

초록

본 연구는 γ-aminobutyric acid (GABA)가 여름철 산란계농장에서 산란계의 생산성에 미치는 영향을구명하기 위하여 수행되었다. 동일한 사육규모(약 5만수/계사)의 계사에 수용된 산란계에게 44일간GABA(100 ppm)를 급여하였고, 유사한 사육규모의 다른 한 동에 수용된 산란계는 비교집단(Ref)으로이용되었다. 매일 최고 및 최저온도, 사료 및 물 섭취량, 산란수, 난중 및 폐사율은 계사단위로 측정 후분석에 이용되었다. 실험기간동안 두 계사 간의 일중 최고 및 최저 온도는 유사하였다. 사료섭취량은실험 개시 시점부터 GABA 처리 및 Ref 사이에 차이가 있었고 종료시까지 지속되었지만(p<0.05), 일일평균산란량과 헨데이산란율은 유사하였다. 그 결과 사료요구율은 GABA 처리구에서 현저히 낮았다(p<0.05). 물섭취량은 처음에 유사하였지만 시간과 더불어 GABA 처리구에서 증가하였고, 따라서 물섭취량 대 사료섭취량의 비는 5일 이후 GABA 처리구에서 현저히 증가하였다(p<0.05). 누적폐사율은 첫15일 동안 GABA 와 Ref간에 유사하였지만 이후 GABA 처리구에서 현저히 낮았고, 그 차이는 시간의경과와 함께 증가하였다. 난중별 비율에서도 차이가 있었으며, GABA 처리구에서 대란의 비율이 높았고특란의 비율은 낮았다(p<0.05). 파란율은 Ref에 비해 GABA 처리구에서 높았지만, 이러한 경향은GABA 급여 개시 전에도 발견되어 GABA 처리와 무관한 것으로 판단되었다. 따라서 본 연구결과는GABA가 여름철 산란계의 폐사율 저감에 기여할 수 있음을 시사한다.

Abstract

The effects of feeding γ-aminobutyric acid (GABA) on performance of laying hens weretested at a commercial layer farm level during summer time. Two hen houses in a farm wereused that have a similar capacity of housing 50,000 hens each; one was used for GABAtreatment and the other served as a reference (Ref) group. GABA (100 ppm) was provided for44 days, during which feed and water intake, egg production and weight, and mortality as wellas high and low temperatures were recorded daily in both groups. Daily high and lowtemperatures were similar between two groups throughout the experimental period. Although feedintake was lower in GABA than Ref from the beginning of the experiment and was consistentlyobserved through the end (p<0.05), both mean daily egg mass and hen-day egg production werenot different resulting in lower feed requirements in GABA than Ref (p<0.05). Cumulativemortality was similar for the first 15 days, but was lower thereafter in GABA than Ref. Egg weight ratios were higher in the range of 52~<60 g but were lower in the weight group of60~<68 g in the GABA treatment group compared with those in Ref (p<0.05). Cracked eggratios were high in GABA than Ref, but this difference was found to occur even before theGABA study started, suggesting involvement in the egg-transferring system to the grading andpackaging center. Taken together, the results suggest that GABA exerts a beneficial effect inalleviating mortality in laying hens during summer time.

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