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모돈의 생산성 향상에 관한 연구 2 . 자돈의 성장형질에 대한 포유자돈 합방의 효과
홍기창(K . C . Hong),전진태(J . T . Jeon),윤덕영(D . Y . Yoon),박홍양(H . Y . Park) 한국축산학회 1991 한국축산학회지 Vol.33 No.8
We examined the effects of litters mixing during pre-weaning period on the growth trait of piglets, and the possible way of selection for the mothering ability of sow on the behavioral basis of piglet using 6 sews and their 53 piglets. A significant difference(p$lt;0.01) was found in the weight at 8-week of age, being 21.95 ㎏ in experimental vs 19.53 ㎏ in control group. This tendency continued until the time of marketing, gaining an additional 3 kg per piglet. The body weight gain of piglet during 4 weeks(from 4 to 8 weeks age) was also significantly higher(p$lt;0.01), being 14.13 ㎏ in experimental us 11.99 ㎏ in control group. Futhermore. it was found that the behavior of piglets toward the better ow could be used as an indication for the better mothering ability of sow, The results suggest that mixing the litter: during pre-weaning period would give beneficial effects on the growth, and provide an alternative way of selection for the sow with better mothering ability.
모돈의 생산성 향상에 관한 연구 1 . 모돈의 생산성 향상을 위한 조기이유에 관한 연구
홍기창(K . C . Hong),전진태(J . T . Jeon) 한국축산학회 1991 한국축산학회지 Vol.33 No.4
74 piglets from 8 sows were weaned at either 3 or 4 weeks of age to examine growth and various aspects of reproductive performance in the weaned pigs and the sows. The number of the live young born was not significantly different between the group weaned at 3 weeks (11.33±0.67) and the group weaned at 4 weeks (10.67±0.33). No significance of the difference was found between the two groups in the number of litter at weaning (9.33±0.33 vs 9.33±0.88) and in farrowing interval (146.67±2.33 days vs 152.33±0.33 days) (p$lt;0.05) indicating that early weaning may not influence the reproductive performance of sows. There were no significant differences in the average body weight at 21(6.21±0.13㎏ vs 6.23±0.16㎏) and 28 days(7.63±0.14㎏ vs 7.90±0.18㎏) between the 3 weeks and 4 weeks group (p$lt;0.05). Average daily gain 3 (56 days to 154 days) (0.62±0.10㎏ vs 0.58±0.02㎏) and the days to 90 ㎏ in body weight(169.05±1.13 days vs 167.33±0.63 days) were also similar in the both groups. These results suggest that early weaning may be employed without any great loss in both sow and litter.
돼지에 있어 적육생산을 위한 선발에 따른 사료섭취량의 변화
홍기창 ( K . C . Hong ) 한국축산학회 1988 한국축산학회지 Vol.30 No.7
Data from three German test stations of the period 1972 to 1982 (n=65630) were analysed to study the development of daily feed intake and of other important traits in the pig and to calculate heritabilily estimates and genetic correlation. During the period, all pigs in German test stations were fed ad libitum in groups of two female full-sibs on a diet of identical composition as regards feed components and energy concentration. For estimating the genetic parameters the periods 1972-1975 and 1979-1982 were analysed seperately for the breeds German Landrace (DL), Belgian Landrace (LB) and Pietrain (PI). Daily feed intake decreases in the three breeds from first to second period. In the LB and DL breeds feed intake decreases by 8% and 4%, respectively. In the PI breed feed intake decreases only by 1%, but average daily feed intake is 8% below that of LB and 15% below that of DL. The other traits feed conversion and meat-to-fat ratio change by 5% to 25% in desired direction. For the genetic analysis all traits are defined as the deviation from a contemporary mean within station. For the contemporary mean the period is 60 days for DL and 90 days for LB and PI pigs. All heritability estimates are based on half-sib analysis. For DL heritability of daily feed intake is .5 in both periods. For LB and PI estimates are unreliable due to the small number of pigs available in the first period, while in the second period the heritability for feed intake is also .5. Genetic correlation between feed intake and some other importance traits are also based on half-sib analysis. There is a very high genetic correlation of .8 between feed intake and weight gain during fattening period in all three beeds, while there is no genetic correlation between feed intake and feed conversion. Genetic correlations between feed intake and backfat thickness and feed intake and meat-to-fat ratio are unfavourable. The correlation between feed intake and backfat thickness is.5 for all breeds, but between feed intake and meat-to-fat ratio it is .5, .6 and .8 for DL, LB and PI, respectively. In German pig breeding backfat thickness and meat-to-fat ratio have higher weights in the breeding value than weight gain and feed conversion, respectively. The decrease in feed intake may be explained by unfavourable correlations between the former two traits and feed intake. To avoid a further decrease in feed intake it has been suggested to include this trait in selection of pigs in the future.