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고섬유 사료와 저에너지-저단백질 사료를 이용한 유도환우 방법이 산란계의 생산성, 계란 품질 및 장기에 미치는 영향
홍의철,나재천,박희두,강근호,강환구,김동욱,유동조,강보석,최희철,서옥석,황보종 한국가금학회 2008 한국가금학회 정기총회 및 학술발표회 Vol.25 No.-
This study was first conducted to compare the effect of feeding molting and fasting molting on the performance, egg quality, and visceral organs in laying hens for animal welfare. One hundred forty four 62-wk-old White Leghorn hens that egg production was over 80% and average weight was 1.6±0.3 ㎏ were used in this study. Treatments were control(non-molt treatment), fasting molt treatment(FRM), and feeding molt treatment(NRMl, NRM2). The four treatments were administered to four replicate group of nine hens wherein each group. All treatment groups were fed the basal diet(CP 15%, ME 2,700 ㎉/㎏) for two weeks as the adaptation period. Induced molt diets were high fiber diets(CF 17%) and low CP-low energy diet(CP 13.2%, ME 2,028 ㎉/㎏). Egg production decreased for 10 days to be 0% at feeding molting treatment, while for 2~3 days at fasting molting treatment. Egg production restarted after 5 and 6 weeks at ending molt at feeding molting treatments, respectively, while after 24 days at fasting molting treatment. On the egg quality was improved at molting treatments (P<0.05) except egg yolk. Egg shell tissue was crowded at molting treatment to compare to control. Liver weights, heart weight, and oviduct weight of laying hens decreased at molting treatments(P<0.05). Finally, feeding molting might could be replaced fasting molting on the welfare and further studies were needed about molting program.
고상식 오리사에서 다양한 사육밀도가 토종 실용오리의 생산성 및 균일도에 미치는 영향
홍의철,강보석,강환구,전진주,김현수,손지선,김찬호 한국가금학회 2019 韓國家禽學會誌 Vol.46 No.4
This study investigated the effects of various stocking densities on the growth performance of Korean native ducks. Twelve hundred day-old ducklings were reared for 50 days in a duck house (windowless, plastic wire-floor pen). Two weeks later, 852 of these ducks (350±30 g) were selected for at least 80% uniformity per stocking treatment (six treatments, four replications/treatment, depending on a stocking density of 4∼9 birds m —2 ). Experimental diets were corn-soybean-based and broiler ducks were grouped based on age [0∼21 days of age (CP 21%, ME 2,900 kcal/kg) and 21∼50 days of age (CP 17%, ME 3,100 kcal/kg)]. Body weight (BW) did not significantly differ among different aged treatment groups (P>0.05); however, uniformity decreased with higher stocking densities (P<0.05). Feed intake and feed conversion ratio of ducks aged 42∼50 days significantly decreased in the T4-6 treatments compared with the T1-3 treatments (P<0.05). In all experimental periods, BW gain was not significantly different among treatments, but feed intake decreased significantly as the stocking density increased (P<0.05), and feed conversion ratio was significantly different among six treatments with stocking density (P<0.05). In conclusion, we found that the stocking density of Korean native ducks in a plastic wire-floor pen was approximately 7 birds m —2 in consideration of productivity and uniformity.