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Zeszyty Naukowe UP - 561 (ebook)

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Opis
This study complied 309 bulls of Red-White breed born in the period between 1982−1999. The yield of milk, fat and protein, and a content of fat and protein in milk were analysed in the first lactation in a group of production traits. In a group of reproduction traits, the age at first calving, and the lengths of the first to fourth calving intervals were determined. For the features characterising length of life and lifetime yield following parameters were studied: lifetime yields and yields for a day of life and of performance of milk, fat, protein, actual length of life and performance, and a number of lactations. Among conformation traits of bulls’ daughters the total score, body capacity, type and conformation, udder, height at sacrum, chest circumference, and following linear features of an udder: depth, width, support, fore and rear attachment, were analysed. In a group of traits of individual bulls’ evaluation the height at withers, chest circumference, massiveness index at the age of 360 days and daily weight gain in 121st to 360th days of life were assessed. Among first ejaculates features the volume of ejaculate, sperm concentration, percentage of spermatozoa with progressive motion, and with primary and secondary defects of morphological structure were taken into consideration. traits of reproductive performance in the first half-year of reproductive management of bulls (number of ejaculates, mean volume of ejaculate, percentage of spermatozoa with progressive motion, total semen volume, sperm concentration, mean number of insemination doses per ejaculate and total number of insemination doses). Genetic values (using mixed model with BLUP method – animal model), heritability and an average annual genetic trend were evaluated for all analysed traits. Analysis of immunogenetic structure was conducted on basis of results of research of 11 group configurations of blood of analysed bulls, where 78 antigens were detected in total. The frequency of occurrence (depending on the configurations) of particular phenotypes (A and S configurations), phenogroups (B and C configurations), genes (J, L, M, Z, T’ configuration) or genotypes (F and R’ configuration) were determined. The three generations (bulls born between: 1982−1987, 1988−1993, 1994−1999), four genetic groups with different genes share of Holstein-Friesian breed (0−25%, 56−50%, 51−75% above 75%), and a size of progeny group (above 10 sons, from 6 to 10, from 4 to 5, and below 4 sons in progeny group) were separated in an analysed population. The results of research point the increase in genetic values of analysed production traits, decrease in the age of the first calving and elongation of inter-calving intervals in subsequent generations of bulls, and in groups of lower participation of genes of Holstein-Friesian breed cattle in bulls’ genotypes.
Podtytuł
Analiza cech produkcyjnych i funkcjonalnych oraz struktury genetycznej buhajów rasy czerwono-białej urodzonych w latach 1982-1999
Data wydania
2008
ISBN/ISSN
1897-4732
Liczba stron
106
Kategoria
Czasopisma naukowe, PUBLIKACJE BEZPŁATNE, Nauki rolnicze, Czasopisma naukowe, Rolnictwo / Ogrodnictwo, Nauki rolnicze
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Projekt jest współfinansowany przez Unię Europejską z Europejskiego Funduszu Rozwoju Regionalnego
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