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).

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    ABSTRACT: Records of fertility and milk produc- tion of 7117 lactations of Israeli Friesian cows from kibbutzim in Israel were analyzed. The objectives were to investi- gate the additive genetic effect on repro- duction and the phenotypic and genetic relationship between reproduction and milk production. Fertility traits were measured in the period prior to the lactation in which milk production was measured. The phenotypic relationship between days open and milk production traits in the succeeding lactation was positive. Abor- tions and retained placenta were associa- ted with decreased milk and delayed conception. The genetic analysis was based on a minimum of 2, 10, or 50 cows per sire. Heritabilities of days open and fat-corrected milk per milking day were around .05 and .15. The genetic correla- tion between the two traits was .62 to .72. The regression of the breeding value of days open on the breeding value of kilogram fat-corrected milk per milking day was approximately 7.
    Journal of Dairy Science - J DAIRY SCI. 01/1979; 62(3):468-474.
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    ABSTRACT: Sire evaluations from first, all, and later lactations for PD milk, fat, and dollars on 338 sires were used to predict deviated relative net income of individual daughters on a per day and lifetime basis. Eleven different relative net incomes, deviated from contemporaries, were cal- culated on 176,902 cows. Variation in individual daughter relative net income accounted for by sire evaluation was statistically significant but small (R 2 = .001 to .005). Progeny group average estimates of deviated relative net income could be predicted with reasonable accuracy (R z = .097 to .360). Models using PD dollars from first and later lactation evaluations had larger coeffi- cients of determination for both per day and lifetime deviated relative net income measures than did models using milk and fat evaluations. Ability to predict prog- eny group averages for lifetime relative net income was superior (R 2 = .199 to .360) to the ability to predict progeny group averages for relative net income per day. Later lactation sire evaluations were more useful than evaluations based on first lactations in the prediction of total lifetime profit. Profit per day of produc- tive life was predicted more accurately from first lactation evaluations than evaluations based on later lactations.
    Journal of Dairy Science - J DAIRY SCI. 01/1988; 71(1):204-213.
  • J. Dairy Science 72 (1989) 2615-2623. 01/1989;


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