Biotechnology in Animal Husbandry - Institut za Stočarstvo

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The evaluation of breeding value ... Swalve (1998) pointed out that the »test-day« model, i.e. data collected on the day of testing are used for analysis instead of concluded lactations calculated based on certain daily controls. Conventional system of data collection is an expensive and slow process, and it is necessary to wait for lactations to be put in order before proceeding with the evaluation of genetic value. By application of »test-day« model the attempt is made to calculate the effect of genetic and paragenetic factors immediately and directly when this effect is exhibited, i.e. on the day of testing. Method officially used by INTERBULL today is multiple trait model using data from many countries, which was developed by Schaeffer and Zhang (1993). This method is based on the hypothesis that the genetic correlation for certain traits between countries is less than one, i.e. that there is interaction between genotype and environment. In this way the milk performance is evaluated, also milk fat and protein yield. Materials and Methods This research included 2.121 Simmental first calvers under control, with lactations completed within one year. All first calvers were located on holdings of individual agricultural producers on the territory of the Republic of Serbia. In selection of model for evaluation of the bull breeding value, it is important to evaluate as accurately as possible, and eliminate the effects of many systematic factors of the environment, and to establish the heritability value for traits included in the selection process. In immediate processing and analysis of data base the following mixed model of least squares was used (Harvey 1990): 1. Mixed model for evaluation of bull breeding value for milk performance traits (BLUP): Yijklm = μ + Bi + Rj + Gk + Sl + eijklm Yijklm = expression of the trait in m cow, daughter of bull-sire i, which produced in j region, and calved in year k and l season μ = general average Bi = random effect of i bull sire Rj = fixed effect of j region Gk = fixed effect of k calving year Sl = fixed effect of l calving season eijklm = random error 129
130 V. Pantelić et al. The evaluation of the breeding value of bulls for following traits: duration of lactation, milk yield, milk fat yield, yield of 4% FCM and content of milk fat, was calculated using mixed model (BLUP), in which equation also random effect of bull sire and fixed effect of region, year and season of calving were included. Bull sires with over daughters – first calvers of Simmental breed in two or three regions, were tested. Number of first calvers ranged from 22 to 215 per bull sire, and total of 2.121 daughters were tested. Results and Discussion Breeding values and bull rank for milk performance traits in standard lactation, evaluated based on production of their daughters in all regions are presented in Table 1. Depending on the structure of linear model, which usually contains combination of several effects on traits, absolute BLUP solutions are obtained which are used for ranking of the selection candidates. Equations/formulas contain effects with fixed (region, year, season) and random classification (sires). Model can also include information about relatives, genetic trend in the population, matrix of kinship, genetic groups or their combination. BLUP is the best linear method because it is the least biased method in evaluation of genetic and paragenetic factors, as concluded by Latinović et al. (1997). The best ranked bull in regard to milk yield was HB 1197 whose production deviated by 357,62 kg, followed by HB 1206 with deviation of 329,60 kg, and on the third place was HB 1334 with deviation of 291,11 kg. The lowest ranked bull was HB 1260 which deviated by -666,69 kg and was ranked on 37th place. In front of him was the bull HB 973 with breeding value of -532,61 kg ranked 36th. At 35th place in regard to milk yield was the bull HB 1039, with deviation of -340,92 kg. Obtained results indicate that the best production was realized by foreign bulls that are on loan in our country or whose semen had been imported for planned insemination of female breeding animals of domestic Simmental population. Some of these bull sires have in their genetic basis certain share of Red Holstein or Montbeliard genes. The lowest ranked bulls were domestic bulls. In regard to the content of milk fat, the best ranked bull was HB 920 (BV 0,08), followed by HB 921 (BV 0,06), and on the third place the bull HB 1319 (BV 0,06). The lowest ranked bull for the percentage of milk fat was HB 1039 (BV -0,09), in front of him, ranked 36 was the bull HB 1189 (PV -0,07), and ranked 35th the bull HB 877(PV -0,05).
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184 D. Vitorović et al. (Vićentij
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186 D. Vitorović et al. Broilers i
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188 D. Vitorović et al. deposition
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190 D. M. Ogah Blasco et al. (1984)
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192 D. M. Ogah Tabe 1. Descriptive
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194 D. M. Ogah chicken genotypes fo
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196 D. M. Ogah HU Y.H. (1999) .Vari
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198 Introduction V. Gerzilov et al.
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200 Results and Discussion V. Gerzi
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202 V. Gerzilov et al. The histolog
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204 V. Gerzilov et al. Table 2. Mic
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Results and Discussion Analysis of
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Analysis of applied biosecurity mea
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244 Y. Aleksiev Table 1. Mean daily
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246 Y. Aleksiev post-shearing, roug
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Materials and Methods Study of bioc
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Study of biochemical polymorphism .
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Study of biochemical polymorphism .
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Physiological aspects of behaviour
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Instruction for authors Papers for
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PETROVIĆ D.M., GUTIĆ M., BOGOSAVL
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Registration fee Registration fee i
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Институт за сточар
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