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 Wysłany: Sob 12:32, 12 Lut 2011 Temat postu: ugg boots günstig Lambing sheep ram effect of the |
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Hu sheep ram Statistical analysis of litter size effects
Lambs are generally single lamb, a few production twins, little three lambs. The Hu sheep litter size can not simply be seen as the ring character, but whether it can be classified as conventional concept of the number of characters, you should also be more in-depth and comprehensive discussion. Can be seen from Table 1, Chao Yang produced three lambs, the proportion of a total of four lambs 38.23, the total number of records in the 1 / 3. This will improve the overall average litter size records of Hu sheep decisive for the rejection,[link widoczny dla zalogowanych], therefore, increase the three lambs, four lambs in the lambing percentage is to increase the overall Hu sheep lambing effective way. But how can we increase this ratio should be many considerations, such as breeding, sheep breeding to improve physical fitness, increase the proportion of school-age ewes, rams bad solution to improve quality. 3.3 single lamb and parity relations can be seen from Table 1, Hu sheep population there is also the single lamb record 15.17. In this collection of information, not found in life, producing a continuous single lamb ewes, but did not find a single lamb between mother and daughter} Although the record is said ram effect of litter size index There was significant difference between values (Table 4),[link widoczny dla zalogowanych], but single lamb in terms of production there was no significant (P> 0.05). As can be seen from Figure 1, single lamb production times of the main Annunciation, the first 4,5,6 and 7, the number of births account for only a single lamb to London all the single lamb 8.02; the first 1,2,3,8 and 9 single lamb fetuses single lamb respectively of the total number of 28.07,13.31,10.03.9.52 and 21. O5, l This shows that single lamb production of Xie Zhuang et al: Effect of litter size of Lake ram leather folding 8I statistical credits and birth (the ewe's age) is closely related. In addition, analysis of the data produced a single lamb can also be seen, Hu sheep litter size is not necessarily only by ~ a Therefore, the mechanism of Hu sheep lambing genetic research should be taken seriously enough. 3.1 The average litter size of different parity calculation of the regression equation the average litter size of different birth record was a typical parabola (Figure 1). Hu sheep lambing peak at 4,[link widoczny dla zalogowanych],5,[link widoczny dla zalogowanych],6 and 7 Yi, this stage is the best fertility ewes} 1 to 3 of the early embryo to birth, 8 and 9 fetal sheep has entered the aging period. This information is only 1 case of fetal first lO,[link widoczny dla zalogowanych], so rounding is not used to configure the equation; due to small sample size 9 child (only 7), 8 birth information into the equation of the multiple correlation coefficient = 0.9998, at highly significant (P <0.o1), and the sample size is large (= 2631), indicating that the estimation equation the role of not only strong, but in a different birth order correction, there is also a strong practical significance and statistical significance. The resulting correction factors obtained (Table 3) can be very accurately ewe litter size of different birth order to correct for ewes with different litter Yi times the comparison and the choice to stay. In addition, different birth litter size correction factor calculation is based on the average 4 to 7 fetal simple average litter size; a 2.49775-based, which is mainly on account of the fertility of ewes with the representation of prime . 3.5 kinds of ram effect of litter size index value of 16 kinds of ram litter size index (Table 4) is the average litter size of daughters ram The corrected results to estimate the least square method. This effect is not estimated using the UP method, one does not consider the genetic relationship between the ram, and second, the daughter of ram are in the same venue, between the effects of free market, only inter-annual effect. This article only as a fixed effect model of ram instead of stochastic model, the results are limited within the field without the spread. Ram on litter size plays a very important role indeed, this ram from Table 4, significant effects can be seen. In reproductive traits, it is generally less emphasis on the role of male livestock], however, the effect of male livestock for breeding and do exist. Fixed this, in the conventional breeding work, should pay attention to male livestock breeding results. That the election to stay ram, should not only consider the crystal, kid level, growth rate, carcass performance, but should pay attention to the litter size index should be the level of reproductive performance ram's descent to determine the optimal test bad.
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