scholarly journals The effect of interaction of systematic factors on milk performance of simmental cows in standard lactation

2012 ◽  
Vol 28 (1) ◽  
pp. 67-75
Author(s):  
M.D. Petrovic ◽  
M.M. Petrovic ◽  
Z. Skalicki ◽  
V. Bogdanovic ◽  
R. Djokovic ◽  
...  
Keyword(s):  
Milk Fat ◽  
Dairy Farm ◽  
Breeding Value ◽  
Family Farms ◽  
Performance Traits ◽  
Dairy Animals ◽  
Total Variability ◽  
Milk Performance ◽  
Calving Season ◽  
Very High

The effect of interaction between the farm and calving season, as well as the farm and group of lactations on milk performance traits (milk yield, yield of milk fat, 4% fat corrected milk and milk fat content) was analyzed on sample of 2805 Simmental cows with total 9718 standard lactations, housed on dairy farm ?Zlatiborski suvati? on Zlatibor (578 cows and 1968 lactations), dairy farm of the Agricultural holding Dobricevo in Cuprija (964 cows and 3237 lactations) and dairy animals housed on family farms/households in the region of Kotraza (1263 cows and 4513 lactations). The significance of the effect of interaction between the farm and calving season, as well as interaction between the farm and group of lactations on all milk performance traits was very high (P<0.001), which justified their inclusion into models for assessment of the breeding value of dairy cows. The share of variance of interactions in total variance of milk performance traits in standard lactations was low (below and around 4%), which clearly indicated even more systematic factors and their interactions which influence the total variability of observed traits of milk performance of cows in standard lactations.

scholarly journals Effect of Non-Genetic Factors on Standard Lactation Milk Performance Traits in Simmental Cows

2015 ◽  
Vol 15 (1) ◽  
pp. 211-220 ◽  
Author(s):  
D. Milun Petrović ◽  
Vladan Bogdanović ◽  
M. Milan Petrović ◽  
Snežana Bogosavljević-Bošković ◽  
Radojica Đoković ◽  
...  
Keyword(s):  
Milk Fat ◽  
Statistical Significance ◽  
Season Of Birth ◽  
Breeding Area ◽  
Birth Season ◽  
Performance Traits ◽  
Milk Performance ◽  
Fat Yield ◽  
Calving Season ◽  
Effect Of Age

AbstractThe effect of systematic and continuous environmental factors on milk performance traits over standard lactations in 2805 Simmental cows was evaluated using the general linear model. The systematic factors included the effect of farm or breeding area, calving season, year of birth, season of birth, lactation group and their interactions. The continuous factor analysed was the effect of age at first conception. The effect of farm, lactation group and calving season on standard lactation milk performance was found to be highly significant (P<0.01), excepting the effect of calving season on milk fat percent in standard lactations which showed statistical significance (P<0.05). The interactions between year and season of birth, farm and calving season, and farm and lactation group had a highly significant effect (P<0.01) on all performance traits studied. Age at first conception, as a continuous factor, had a highly significant effect (P<0.01) on milk yield and milk fat percent, and a non-significant effect on milk fat yield. The model used to correct the performance traits over standard lactations for the effect of systematic factors was highly significant (P<0.01). The variance of the model accounted for 20.06 and 37.31% of the total variance of milk fat yield and milk fat percent, respectively. The resulting coefficients of determination (R2) ranged from 0.20 for milk fat yield to 0.37 for milk fat percent.

scholarly journals The effect of the farm size on milk traits of cows

2011 ◽  
Vol 27 (3) ◽  
pp. 951-958 ◽  
Author(s):  
D. Kucevic ◽  
S. Trivunovic ◽  
M. Radinovic ◽  
M. Plavsic ◽  
Z. Skalicki ◽  
...  
Keyword(s):  
Milk Yield ◽  
Milk Fat ◽  
Dairy Farm ◽  
Farm Size ◽  
Small Farms ◽  
Milk Traits ◽  
Holstein Friesian ◽  
Milk Performance ◽  
Fat Yield ◽  
Large Farms

Objective of this study was to analyze the effect of the dairy farm on milk traits of cows in Vojvodina. The research was carried out on small farms with 10 to 20 cows, medium farms with 20 to 50 cows, and large farms with over 50 dairy cows. The study included registered animals of Simmental (SM) and Holstein-Friesian breed (HF; including Red Holstein) in the first lactation for traits of milk yield and yield and content of milk fat. Total of 1323 first lactations were analyzed. The average milk yield (both breeds) in the first lactation of 305 days was 6295 kg of milk with 234,3 kg of milk fat and average milk fat content of 3,74%. Milk performance of cows varied significantly (CV=22,9% and SD=1447,8), as well as milk fat yield (CV=21,6% and SD=50,8). Large farms produced in average 6534 kg of milk, medium farms 6347kg and small farms 4717kg. Size of the farm exhibited significantly high effect on all observed traits, and the tendency was that farms with higher number of animals realize also higher average of production. Farm management and various breeding-zootechnical conditions present on farms had significant effect on milk performance of cows.

scholarly journals Relationship between the insertion/deletion polymorphism within the promoter and the intron 1 sequence of the PRNP gene and milk performance traits in cattle

2011 ◽  
Vol 56 (No. 4) ◽  
pp. 151-156 ◽  
Author(s):  
J. Strychalski ◽  
U. Czarnik ◽  
M. Pierzchała ◽  
C.S. Pareek
Keyword(s):  
Protein Content ◽  
Milk Fat ◽  
Prnp Gene ◽  
Promoter Sequence ◽  
Protein Yield ◽  
Indel Polymorphism ◽  
Genomic Location ◽  
Intron 1 ◽  
Performance Traits ◽  
Milk Performance

Current studies on the prion protein (PRNP) gene polymorphism focus primarily on the causative mutations that influence BSE susceptibility in cattle. The specific genetic structure determined by the insertion/deletion (indel) polymorphism within the 23 bp promoter sequence and the 12 bp intron 1 sequence of the PRNP gene, and its genomic location suggest that this polymorphism can be a potential QTL marker. The objective of the present study was to determine whether the indel polymorphism within the promoter sequence (23 bp) and the intron 1 sequence (12 bp) of the PRNP gene can be used as a factor differentiating the values of milk performance traits. The experimental materials comprised 285 primiparous Polish Holstein-Friesian cows, daughters of two dihybrid (23ins-12ins/23del-12del) sires (progeny of sire 1 &ndash; 149 cows, progeny of sire 2 &ndash; 136 cows). The following milk performance traits were analysed: milk yield, milk fat yield, milk protein yield, fat and protein contents of milk during the first 305-day lactation. The polymorphism in the promoter region (23 bp) was found to have a significant (P = 0.040) effect on protein yield and a highly significant (P = 0.007) effect on the protein content of milk. The highest values of these traits were noted in 23 ins/del heterozygotes and the lowest in 23 del/del homozygotes. There was an interrelation between diplotype variants and the concentrations of milk components. The protein content of milk was highly significantly (P = 0.007) higher in 23ins-12ins/23del-12del heterozygotes and significantly (P = 0.028) higher in 23ins-12ins/23ins-12ins homozygotes, compared to 23del-12ins/23del-12del cows. 23ins-12ins/23del-12del heterozygotes were also characterized by a significantly (P = 0.046) higher fat content of milk, in comparison with 23del-12del/23del-12del homozygotes.

scholarly journals Schätzung genetischer Parameter für Testtagsergebnisse von Milchleistungsmerkmalen bei Bunten Deutschen Edelziegen

2004 ◽  
Vol 47 (2) ◽  
pp. 193-202
Author(s):  
D. Bömkes ◽  
H. Hamann ◽  
O. Distl
Keyword(s):  
Protein Content ◽  
Milk Yield ◽  
Milk Fat ◽  
Genetic Parameters ◽  
Genetic Correlations ◽  
Protein Yield ◽  
Lower Saxony ◽  
Genetic Progress ◽  
Performance Traits ◽  
Milk Performance

Abstract. Title of the paper: Estimation of genetic parameters for test day records of milk performance traits in German Improved Fawn The objectives of this study were to estimate genetic parameters for milk performance traits of German Improved Fawn by using univariate und multivariate animal models. The analysis was based on 27,778 test day records of 1,848 German Improved Fawn with 3,574 lactation records distributed over 229 flocks in Lower Saxony, Saxony and Baden-Wuerttemberg. Milk records were sampled between 1988 and 2002. The animals in our analysis were the progeny of 455 sires and 1.148 does. Heritabilities estimated with a multivariate test day model with fixed regression were h2 = 0.19, 0.16 and 0.15 for milk, fat and protein yield. For fat and protein content and Somatic Cell Score (SCS) heritabilities were h2 = 0.17, 0.14 and 0.16, respectively. The additive genetic correlations between milk yield and fat as well as protein yield of German Improved Fawn were very high and positive (rg = 0.84 and rg = 0.77). Milk yield and milk contents were genetically negative correlated with rg = −0.28 for fat and rg = −0.22 for protein content. A moderate additive genetic correlation (rg = 0.48) between fat and protein content was estimated. There were no considerable additive genetic correlations between fat yield and protein content as well as between fat content and protein yield (rg = 0.05 and rg = 0.09). Additive genetic correlations between milk, fat or protein yield and SCS were high and negative, whereas additive genetic correlations between fat or protein content and SCS were low and positive. The genetic parameters estimated from field test records allow to achieve genetic progress in milk performance traits of German Improved Fawn.

scholarly journals Phenotypic correlation of traits of production and reproduction of Simmental cows in different regions of Serbia

2019 ◽  
Vol 35 (3) ◽  
pp. 219-228
Author(s):  
Vlada Pantelic ◽  
Dragan Niksic ◽  
Nevena Maksimovic ◽  
Dusica Ostojic-Andric ◽  
Marina Lazarevic ◽  
...  
Keyword(s):  
Milk Fat ◽  
Breeding Value ◽  
Phenotypic Correlation ◽  
Agricultural Producers ◽  
Phenotypic Correlations ◽  
Service Period ◽  
Milk Performance ◽  
Breeding Selection ◽  
The Republic ◽  
One Year

The main goal of this research was to examine, using modern methods, the variability of phenotypic correlations of production performances and reproductive properties of Simmental cows reared on the farms of individual agricultural producers, in different breeding areas of the Republic of Serbia. The study of phenotypic correlations of milk performance and fertility properties in different regions of Serbia was carried out on a total of 3.056 primi parous Simmental heifers under control, with lactations completed within one year. The examined animals were reared on different individual farms, and mainly in very different conditions of housing and nutrition, depending on the breeding area. The study of phenotypic correlations included the following milk performance traits: milk yield, milk fat content, milk fat yield, yield of 4% corrected milk; and fertility properties: age at first calving and service period. The results of the study among other things indicate that although the phenotypic correlations between the fertility and milk performance properties show different degrees of variation, they should be taken into account in the final assessment of the breeding value of the animal, so that the breeding selection programs are more comprehensively designes.

scholarly journals Polymorphism of CSN3, Pit-1, LGB and its impact on milk performance traits at the Czech Fleckvieh and Holstein breed

2008 ◽  
Vol 56 (1) ◽  
pp. 131-136
Author(s):  
Ivan Manga ◽  
Jan Říha ◽  
Irena Vrtková
Keyword(s):  
Milk Yield ◽  
Milk Fat ◽  
Single Gene ◽  
Cattle Breed ◽  
Holstein Cows ◽  
Single Nucleotide ◽  
Holstein Breed ◽  
Lactation Stage ◽  
Performance Traits ◽  
Milk Performance

The effect of known CSN3, Pit-1 and LGB genes single nucleotide polymorphism (SNP) on milk performance traits (milk yield, protein, fat and lactose content, count of somatic cells) at the Czech Fleckvieh and the Holstein cattle breed was estimated. For more exact results, tested cows of each breed came from one source, and were selected into two groups according to their lactation. We tested around 100 animals at the first and 25 at the high (more than five) lactation of both breeds. Our attention was aimed particularly on combined genotypes of favourable alleles. We confirmed the positive tendention of the cheese yield valuable CSN3/BB with Pit-1/AA combined genotype for high milk production. By estimation of single gene effect, we found out significant association (P ≤ 0.01) between milk yield (kg) and Pit-1 genotypes at Holstein cows with the high lactation. This dependence was observed at the Czech Fleckvieh breed too, even it didn’t get conclusive value. Among all tested individuals, CSN3 genotypes significantly influenced milk yield (AA > BB, P ≤ 0.01), milk fat (BB > AA, P ≤ 0.01) and protein content (BB > AA, P ≤ 0.01). The genotypes AB and BB of the LGB gene at Holstein cows were joined with higher milk yield in selected cattle groups opposite to AA genotype (P ≤ 0.01, P ≤ 0.05). The influence of LGB on the somatic cell count in created cattle groups was not confirmed. Estimation of allele and genotype frequency according to lactation stage didn’t reveal higher differences at non of tested genes in both breeds.

scholarly journals The influence of genetic β-lactoglobulin polymorphism on the quantity and quality of milk of the Simmental breed in Serbia

Genetika ◽  
2021 ◽  
Vol 53 (1) ◽  
pp. 263-270
Author(s):  
Dragan Niksic ◽  
Vlada Pantelic ◽  
Dusica Ostojic-Andric ◽  
Dragan Stanojevic ◽  
Nikola Delic ◽  
...  
Keyword(s):  
Milk Fat ◽  
Rflp Analysis ◽  
Point Of View ◽  
Great Economic Importance ◽  
Pcr Rflp ◽  
Performance Traits ◽  
Milk Performance ◽  
Quality Of Milk ◽  
Β Lactoglobulin

The study of the link between genes controlling protein polymorphism and milk performance traits of domestic animals has great economic importance from a selection point of view, as it reduces the generation interval, leading to increased productivity in livestock. The objective of this paper was to establish the influence of genetic ? -lactoglobulin polymorphism on the quantity and quality of milk of the simmental breed in Serbi?. For the research blood samples were taken from a total of 157 Simmental cows. The genotypes of Simmental cows for ?-lactoblobulin and their effect on quantitative milk performance traits were determined using the PCR-RFLP analysis. The variability of traits influenced by the genetic polymorphism of ?-lactoblobulin was statistically very highly significant (p <0.0001) for milk yield in standard lactation and milk fat and protein yields, while it showed no statistically significant variability (p> 0.05) for content of milk fat and protein. The genotype cows achieved a 121 kg and 338 kg increase in milk production compared to the BB genotype and AA genotype cows, respectively.

scholarly journals Results of the application of the technology of genetic improvement of Simmental cattle population in Serbia

2006 ◽  
Vol 22 (1-2) ◽  
pp. 1-8 ◽  
Author(s):  
Milan Petrovic ◽  
Ljiljana Sretenovic ◽  
Vlada Pantelic ◽  
Stevica Aleksic ◽  
Branislav Miscevic ◽  
...  
Keyword(s):  
Milk Fat ◽  
Genetic Improvement ◽  
Mixed Model ◽  
Breeding Value ◽  
Production Traits ◽  
Cattle Population ◽  
Method Of Least Squares ◽  
General Average ◽  
Simmental Cattle ◽  
Calving Season

Results of production traits obtained from first calving cows and evaluation of the breeding value of bull sires of Simmental breed in Serbia. Data was analyzed using the method of least squares and for evaluation of bulls' breeding value mixed model of random sire effect (BLUP method). Based on obtained results it was established in statistical analysis that breeding region had highly significantly affected (P<0.01) the deviation of production traits from the general average. Considerable deviation from the general average was caused by the year and season of calving (P<0.05), and interaction of breeding region and calving season contributed to high variation in yield of milk and milk fat (P<0.01).

scholarly journals The effect of systematic factors on milk yield in Simmental cows over complete lactations

2009 ◽  
Vol 25 (1-2) ◽  
pp. 61-71 ◽  
Author(s):  
M.D. Petrovic ◽  
Z. Skalicki ◽  
M.M. Petrovic ◽  
V. Bogdanovic
Keyword(s):  
Milk Yield ◽  
Milk Fat ◽  
Dairy Farm ◽  
Fat Content ◽  
Season Of Birth ◽  
Production Traits ◽  
Group Interactions ◽  
Calving Season ◽  
Lactation Duration ◽  
Agricultural Farm

The effect of systematic factors on production traits over complete lactations was investigated in 2,805 Simmental cows born in 1982 and onwards. The cows were housed at three farms in different areas: at the Zlatiborski Suvati dairy farm, Zlatibor, at the Dobricevo Agricultural Farm, Cuprija and at private farms in the region of Kotraze. The systematic factors (farm, calving season, lactation groups, group (year x season of birth), farm x calving season and farm x lactation group interactions) and age at first conception had statistically highly significant (P<0.001) effects on all complete lactation traits, with the exception of the effect of calving season on complete lactation duration (P<0.05) and milk-fat content (P>0.05). No statistically significant effect was produced by age at first conception on complete lactation duration and milk-fat content (P>0.05). Determination coefficients ranged from 0.100 in complete lactation duration to 0.361 in milk-fat content. .

scholarly journals The evaluation of breeding value of simmental bulls for milk performance in Serbia

2011 ◽  
Vol 27 (2) ◽  
pp. 127-135
Author(s):  
V. Pantelic ◽  
M. Plavsic ◽  
S. Trivunovic ◽  
S. Aleksic ◽  
Lj. Sretenovic ◽  
...  
Keyword(s):  
Milk Fat ◽  
Mixed Model ◽  
Random Effect ◽  
Breeding Value ◽  
Agricultural Producers ◽  
Additive Gene ◽  
Milk Performance ◽  
The Republic ◽  
One Year ◽  
Lactation Duration

The basis for selection work is knowledge of the quality of bull sires used for conception, as well as how the major traits are passed on to the progeny. BLUP method (Best Linear Unbiased Prediction) is the basis of the most favourable solution for evaluation of additive gene value in cattle production, and it is implemented in various variants depending on the structure of data used. This research included 2.121 Simmental first cavers 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. Evaluation of the bull breeding value for lactation duration, milk production, milk fat yield, yield of 4% FCM and percentage of milk fat, was carried out by using the mixed model (BLUP), the calculation included random effect of bull sire and fixed effect of the region, year and season of calving. In this study, bull sires which had in two or three regions over 20 daughters - first calvers of Simmental breed. Number of first calving heifers ranged from 22 to 215 animals per bull sire. By using BLUP method in evaluation of breeding value of bulls in terms of yield of milk, milk fat, content of milk fat and 4% FCMI and by ranking, results were obtained showing superiority and inferiority of breeding males.

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