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Holstein 수소와 거세우 및 Zeranol 투여 거세우의 성장 단계별 혈액상과 혈청 대사물질 및 호르몬 농도의 변화
홍병주,김종복,김현섭,권응기,남기택,윤상기 한국동물자원과학회 2001 한국축산학회지 Vol.43 No.4
This experiment was conducted to investigate changes in hematological values and concentrations of serum metabolites and hormones during the growth of Holstein bulls, steers and steers with Zeranol injection. Animals were assigned into 3 groups, bull group (n=8), steer group (n=8) and zeranol group (n=8, injected with zeranol from 80㎏ to 450㎏ BW). Sixteen Halstein steers in steer group and Zeranol group were castrated at 2 month after birth and zeranol group was injected hypodermically with 36㎎/head of zeranol on the tail side at every 90 day. RBC, Hb, HCT values of zeranol group at the final stage of 650㎏ were significantly decreased and MCHC value was increased compared with steer group (P$lt;.OS), but WBC, MCV and MCH values remained same. Serum glucose concentrations of animals at 300㎏ BW were higher compared with those at different growing stages. Although all chemical values in serum at 500㎏ were not different between the treatment groups, SUN, albumin, cholesterol, triglyceride and calcium concentrations of zeranol group at the final stage (650㎏) were higher than those of other groups. Serum IGF-I concentration at the start of the experiment was not different among the treatments ranging from 5.24 to 8.29ng/㎖ and started to increase afterhood until animals reached 300㎏ of body weight. At 300㎏ BW, serum IGF-1 concentration of bull group was higher than that of steer group (350.2 vs 266.2ng/㎖, P$lt;.05). At 500㎏ BW, IGF-I concentrations of bull group and zeranol group were 525.6 and 504.6ng/㎖ respectively which are higher (P$lt;.05) than that of steer group (398.7ng/㎖). Similarly, serum insulin concentration was not different between treatments until animals reached 300㎏ BW ranging from 5.65 to 7.81ng/㎖. However, at 500㎏ BW bull group showed significantly lower (17.35ng/㎖) insulin concentration than that (24.76ng/㎖) of steer group (P$lt;.05).
Holstein 종 젖소의 소규모 축군에 있어서 Somatic Cell Score 에 대한 유전모수 추정
안병석,최유림,강수원,권응기,조용민,나기준 한국동물자원과학회 2001 한국축산학회지 Vol.43 No.5
A milking records of 551 heads tested from 1997 to 2000 at National Livestock Research Institute(NLRI) were used to estimate genetic parameters of somatic cell score(SCS) in different lactation period in Holstein Cattle. The cows were fed according to NRC and managed by the method of NLRI. Milk yields were recorded twice a day with 12 hours interval and somatic cell count(SCC) was analysed by Milkoscan 4000^ⓡ for every month, and transformed into SCS= log₂(SCC/100000) + 3. A lactation was divided into three periods which were early(earlier than 90 days in milk). middle(91 to 200 days in milk), and late period(later 201 days in milk). Average somatic cell score of herd was 3.07±2.10. Heritabilities for early, middle, late, and whole period were 0.18, 0.39, 0.47 and 0.34, respectively. Genetic correlations between SCS and milk yield varied from -0.01 to 0.13, and phenotypic correlations were 0.05, -0.01, 0.04 and 0.01 in early, middle, late and whole period, respectively. SCS and immunoglobulin G(IgG) was highly correlated.
rbST 투여가 Holstein 비육우의 혈중 및 도체 호르몬 농도 변화에 미치는영향
김준식,김종복,김현섭,권응기,남기택,윤상기 한국동물자원과학회 2000 한국축산학회지 Vol.42 No.4
This experiment was conducted to investigate the effects of rbST administration on the changes in the concentration of blood and carcass hormones in Holstein bulls and steers. A total of thirty-two Holstein calves including twenty-four Holstein steers castrated at about 2 months after birth were randomly assigned to one of four treatments; bull group, steer group (only castration), rbST₁ group (steer injected with rbST at about 80kg BW) and rbST₂ group (steer injected with rbST at about 300㎏ BW). rbST was injected every 14 days at the dose of 0.03㎎/㎏/day in turn on the rump and the shoulder. Serum bST concentration at 100㎏ BW was higher in rbST, group (39.08ng/㎖) than in steer group (7.80ng/㎖), and also that at 500 and 650㎏ BW were higher in rbST treatment groups (1.15-3.98ng/㎖) than in steer group (0.33-0.63ng/㎖). The highest serum bST concentration by the lapse of time after rbST injection (0, 2, 7, 10, 14d) was obtained at 2 days after bST injection in rbST₂ group (26.40ng/㎖), which was about 2.8-10.4 times higher compared with that in rbST₁ group (9.50ng/㎖) and in steer group (2.55ng/㎖). IGF-I concentration was also highest 2 days after bST injection in order of rbST₂(442.41), rbST₁(333.38) and rbST_0 (187.40ng/㎖). Serum cortisol concentration was increased as the growth stage progressed in all treatments, especially showing increase of 1.15-1.63㎍/㎗ at 300㎏ BW. Cortisol concentration in steer groups after 300㎏ BW tended to be higher than any other groups. The bST concentrations in rump, shoulder, muscle, kidney and liver were not significantly different between rbST treatment and rbST non-treatment group, but tended to be increased in rbST compared to non-rbST treatment. In conclusion, additional studies on livestock products treated by rbST are continuously to be needed in considering palatability of consumers who prefer a high quality and safe food products.
rbST 의 투여 시기가 Holstein 거세우의 혈액성상 및 혈중 대사물질 변화에 미치는 영향
김준식,홍병주,김현섭,권응기,남기택,윤상기 한국동물자원과학회 2000 한국축산학회지 Vol.42 No.3
This experiment was conducted to investigate the effects of rbST administration on hematological values, blood chemistry components and hormone changes in Holstein steers. Twenty-four Holstein steers castrated at 2 months after birth were randomly assigned to one of three treatments; control (rbST non-treatment, rbST_0), rbST treatment at about 80㎏ BW (rbST₁) and rbST treatment at about 300㎏ BW (rbST₂). rbST was injected every 14 days at the dose of 0.03㎎/㎏/day in turn on the rump and the shoulder. The values of RBC, Hb and HCT at the treatment of rbST were significantly decreased compared to rbST_0 (p $lt; .05), regardless of rbST injection time. Glucose concentration was highest at about 300㎏ BW in all treatments, especially significantly higher at rbST treatment groups than at rbST non-treatment group(p $lt; .05). BUN and albumin cocentrations appeared to be decreased in the rbST treatment groups from about 300㎏ BW. Total cholesterol and triglyceride concentrations were responsed differently according to growth stage and rbST treatment, and total protein, Ca and P concentrations were not significantly different among treatments. Serum IGF-I concentration tended to be increased with growth developed, especially higher in rbST treatment groups (556.2-569.5ng/㎖) than in rbST non-treatment group (398.7ng/㎖) at about 500㎏ BW. On the contrary, serum insulin concentration at about 300㎏ BW was significantly lower in rbST₂ (11.44ng/㎖), and that at about 500㎏ BW was lower in rbST₁ (16.37ng/㎖) and rbST₂= (13.10ng/㎖) than in control (24.76ng/㎖).
Holstein 종 젖소 초산우의 최고 비유량 및 비유 지속성에 미치는 환경효과 추정
안병석,김준식,최성복,최유림,정하연,권응기,박성재,기광석 한국동물자원과학회 2000 한국축산학회지 Vol.42 No.5
This study was carried out to estimate environmental effects such as calving season, calving year on peak milk yield, days in milk at peak production(PKD), drying-off milk yield on 305-day, 305D milk yield, and persistency. The data used in this study were milk yield records from first freshened Holstein cows(187 heads) bred in National Livestock Research Institute from 1990 to 1996. Calving season, sire and calving year didn't affect days in milk at peak(PKD). But peak milk yield(PKM) was significantly affected by calving season(p$lt;.01) and calving year(p$lt;.05). Calving season, sire and calving year significantly affected the drying-off milk yield at 305D(DRYM) related to persistency(p$lt;.05). The PKD was 58.2±23.2day, peak milk yield was 26.2±3.9㎏ and drying-off milk yield on 305-day was 15.7±3.5㎏. The persistency showed 60.3 13.8%, and the phenotypic correlations of persistency between PKD and DRYM was positive.