Article

Phenotypic and genetic parameters of reproductive traits of black and white cows with different share of HF genes

Biotechnology in Animal Husbandry 01/2007; 23:193-199. DOI: 10.2298/BAH0701193P

ABSTRACT In this paper, results of the effect of direct and indirect selection of quantitative fertility traits of cattle end heritability level are presented. Study of the quantitative genetic parameters was carried out on three large farms of Black and White, Holstein-Friesian cattle. Investigation included 3900 first calving cows, daughters of 54 bull sires. The effect of genetic group of the head of cattle (genotype) and of the herd on fertility and milk traits of heifers and first calving cows of Black and White breed was investigated. Genetic group of the head of cattle (genotype) had no significant effect in variation of the fertility traits compared to general average (P<0.01). The effect of herd caused statistically significant and highly significant deviation from the general average, P < 0.05 and P < 0.01. Established heritability coefficients for fertility traits had low values for age at insemination (0,112), duration of pregnancy (0,045) and duration of service period (0,097). Results were obtained by applying mathematical-statistical analysis of data – using mixed model (Harvey, 1990). Mathematical-statistical analysis of data was carried out using linear methods with fixed influence through model of Least Squares (LS method). Genotype of the head of cattle caused no significant deviation of fertility traits (P>0,05).

Download full-text

Full-text

Available from: Dusica Andric, Sep 12, 2014
0 Followers
 · 
77 Views
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Black and White low land dairy cattle have very pronounced ability for high production of milk. Fertility is the major trait of cattle and key factor in successful milk production. Fertility traits have pronounced variability and low heritability value. Fertility is regularly limiting factor in attempts to increase the milk yield. Age of dairy cattle at first conception is one of the major reproduction properties. Age of calves at first calving depends mainly on age at first conception. Previous researches have indicated what would be the optimum age at first conception of Black and White heifers. Age at first conception is determined by the date of birth and date of first conception. Knowledge of the strength of the environment factors on age at first conception in high yielding cows is important from the aspect of their inclusion into the model. According to the significance of individual systematic factors, their objective assessment was carried out for the purpose of accurate evaluation of obtained results. Objective of this paper is to study the age at first conception of high yielding Black and white cows through major systematic influences, by applying adequate methodology. Cows comprising the studied sample (n=331) belong to European type of Black and White dairy cattle in final stage of improving of this breed with Holstein-Friesian breed. Average age of dairy cattle at first conception was 491.19±9.36 days or 16.15±0.31 months. According to cows' the values were following: 479.31 days (> 73% HF), 486.12 days (58-73%HF) and 508.14 days (< 58% HF).
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Spasic Z., B. Milosevic, N. Lalic, S. Samardzicc, Z. Ilic, and B. Ristanovic (2012): Comparation of heredity coefficients of productive traits in the population of black white cows. - Genetika, Vol 44, No. 2, 317 - 324. On the basis of genetic variability of economically important traits we orientate ourselves toward specific methods development and use in genetic improvement of a population. However, the heritability (h(2)) is important for giving the answer, which traits can be included in the breeding value evaluation of a population. For determining the heritability 1502 black white breed cows were used: 751 mothers and 751 daughters (together 6393 lactations). The heritability coefficient of investigated traits in cows was calculated using three methods: regression of daughters to mothers, intraclass correlation according to bulls-sires and, for those features for which recurrence exists during the life we used method of repeatability (R). For average milk yield, milk fat and fat edited milk during standard lactations by the method of regression and repeatability intermediate coefficients of heredity were determined (from 0,291 to 0,323), while by the interclass correlation were determined high coefficients (from 0,461 to 0,543). The heritability coefficients for average content of milk fat were low (from 0,029 to 0,192), thus further improvement of this quantitative trait in the population would be possible mainly via bulls sires with the higher genetic potential.
    Genetika 01/2012; 44(2):317-324. DOI:10.2298/GENSR1202317S · 0.49 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: The aim of the paper was to evaluate the possible interaction between the presence of swine infectious diseases and low levels of mycotoxins in swine feed. The material for this research included the samples from three swine farms, where health disorders in different swine categories were detected. The applied research methods included: epidemiological and clinical evaluation, pathological examination, bacteriological and virological laboratory testing and microbiological feed testing, in order to examine the presence of fungi and mycotoxins by the method of thin layer chromatography. Beside this, the molecular diagnostic method, reverse transcripton-polymerase chain reaction (RT-PCR) and viral isolation was included. The obtained results support the existance of positive interaction between the mycotoxins and causative agents of bacterial and viral swine infective diseases. Key words: infective diseases, swine mycotoxicoses
    09/2014; 30(4):433-444. DOI:10.2298/BAH1403433P