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The aim of the study was to determine the effect of two feeding systems (TMR - group I, pasture - group II) on physicochemical properties of milk, its suitability for making rennet cheese and butter, and sensory properties of these products. The study was conducted with second and third lactation Simmental cows between 30 and 200 days of lactation. Total milk yield for the lactation period was 6000...
The aim of the study was to investigate associations between SLC27A1 genotypes and estimated breeding value of milk production traits (milk, fat and protein yield, kg; fat and protein content, %) in the Polish Holstein-Friesian cows’ herd. Three single nucleotide polymorphisms were genotyped,the g.14996C>G. in the exon 3, g.14791C>T in exon 4 and g.14589A>G in exon 5 of SLC27A1 gene.The genotype...
In the present study, the detection of difficult conceptions in dairy cows using selected data mining methods – na ve Bayes classifier (NBC) and regression and classifications trees (CART) is presented. The set of 11 diagnostic variables was used, which included, among others, number of lactation, artificial insemination (AI) season, age of inseminated cow, proportion of HF-genes in cow genotype,...
An attempt was made at identifying the activity of acid phosphatase (AcP) and β-Nacetylhexosaminidase (Hex) in the whole raw milk of cows maintained on ecological farm and over the autumn/winter and spring/summer seasons (AW and SS season, respectively) fed with typical feeding rations. Both enzymes play a crucial role in animals’ metabolism, affect the technological properties of milk and are indicators...
The aim of the study was to establish the relationship between parametres included in the glucose tolerance test (GTT) of heifers aged 9-10 months and their subsequent milk yield and composition in lactation I. Used were 42 Holstein-Friesian heifers selected from the herd with a mean individual yield of 9600 kg milk/year with 4.32% fat and 3.44% protein. Over 24 hrs preceding the GTT the animals were...
The objective of the study was to identify an association between the genotypes of BoLA-DRB3.2 loci (*16/- and *23/-) and occurrence of sub-clinical mastitis or latent mammary gland infections caused by different bacterial species in dairy cows. Blood was withdrawn from of 275 cows from two Polish dairy herds, and animals were genotyped for BoLA-DRB3.2*16 and BoLA-DRB3.2*23 using MPTPCR technique...
Two novel single nucleotide polymorphisms (SNPs) were found in the bovine β4-defensin gene intron – A/C transversion at position 1674 and C/T transition at position 1877 – both recognized with BsrI endonuclease. Observed frequencies of the A1674C AA, AC, CC genotypes were 0.65, 0.32 and 0.03, respectively, while those of alleles A and C – 0.81 and 0.19. For the C1877T polymorphism in the Polish-Friesian...
The objectives of this study were to estimate the heritability (h2) of body condition score (BCS), body conformation (type) and production traits of Black-and-White cows maintained by small farmers of Eastern Poland as well as genetic (rG) and phenotypic (rP) correlations between the traits mentioned. Considered were 2012 cows with completed 305-day lactation from the years 1997-1999.The h2 estimate...
The aim of the study was to estimate the content of functional components of milk in some major cattle breeds. The study was performed in two parts. The first was conducted on Black-and-White (BW) and Polish Red (PR) cows. All animals were kept as one herd at Popielno, and maintained according to the traditional extensive feeding system. Bulk milk samples were used, representing the milk of 349 Simmental...
The aim of presented study was to estimate the influence of calving season, cow body weight, calf body weight at birth on body weights and daily gains of large calibre beef breeds calves, i.e. Charolaise and Simmental. Estimations were made of the effect on the body weight and daily body gain of calves of the following factors: cow genotype (purebred Charolaise or Simmental, 50% of Charolaise or Simmental...
Associations were analysed between the bovine growth hormone combined genotypes (GH/AluI-MspI) and milk production traits in a total of 900 Polish Black-and-White (Polish Friesian) cows. PCR-RFLP method was used for genotyping. The following were frequencies of GH/AluI-MspI: 0.463 LL/++, 0.276 LV/++, 0.157 LL/+-, 0.059 LV/+-, 0.025 VV/++, 0.019 LL/-- and 0.001 (only 1 observation) of VV/+-.Significant...
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