scholarly journals Estimation of Breeding Value for Milk Production Traits in a Holstein Herd with Incomplete Relationships

1999 ◽  
Vol 70 (8) ◽  
pp. 97-105
Author(s):  
Osamu SASAKI ◽  
Naoyuki YAMAMOTO ◽  
Kenji TOGASHI
Keyword(s):  
Milk Production ◽  
Breeding Value ◽  
Production Traits ◽  
Milk Production Traits

scholarly journals The effectiveness of genomic selection for milk production traits of Holstein dairy cattle

2020 ◽  
Vol 33 (3) ◽  
pp. 382-389 ◽  
Author(s):  
Yun-Mi Lee ◽  
Chang-Gwon Dang ◽  
Mohammad Z. Alam ◽  
You-Sam Kim ◽  
Kwang-Hyeon Cho ◽  
...  
Keyword(s):  
Genomic Selection ◽  
Milk Production ◽  
Genetic Gain ◽  
Milk Fat ◽  
Breeding Value ◽  
Production Traits ◽  
Milk Production Traits ◽  
Data Set ◽  
Selection For ◽  
Estimated Breeding Value

Objective: This study was conducted to test the efficiency of genomic selection for milk production traits in a Korean Holstein cattle population.Methods: A total of 506,481 milk production records from 293,855 animals (2,090 heads with single nucleotide polymorphism information) were used to estimate breeding value by single step best linear unbiased prediction.Results: The heritability estimates for milk, fat, and protein yields in the first parity were 0.28, 0.26, and 0.23, respectively. As the parity increased, the heritability decreased for all milk production traits. The estimated generation intervals of sire for the production of bulls (L<sub>SB</sub>) and that for the production of cows (L<sub>SC</sub>) were 7.9 and 8.1 years, respectively, and the estimated generation intervals of dams for the production of bulls (L<sub>DB</sub>) and cows (L<sub>DC</sub>) were 4.9 and 4.2 years, respectively. In the overall data set, the reliability of genomic estimated breeding value (GEBV) increased by 9% on average over that of estimated breeding value (EBV), and increased by 7% in cows with test records, about 4% in bulls with progeny records, and 13% in heifers without test records. The difference in the reliability between GEBV and EBV was especially significant for the data from young bulls, i.e. 17% on average for milk (39% vs 22%), fat (39% vs 22%), and protein (37% vs 22%) yields, respectively. When selected for the milk yield using GEBV, the genetic gain increased about 7.1% over the gain with the EBV in the cows with test records, and by 2.9% in bulls with progeny records, while the genetic gain increased by about 24.2% in heifers without test records and by 35% in young bulls without progeny records.Conclusion: More genetic gains can be expected through the use of GEBV than EBV, and genomic selection was more effective in the selection of young bulls and heifers without test records.

scholarly journals Effect of DGAT1, BTN1A1, OLR1, and STAT1 genes on milk production and reproduction traits in the Czech Fleckvieh breed

2014 ◽  
Vol 59 (No. 2) ◽  
pp. 45-53 ◽  
Author(s):  
J. Rychtářová ◽  
Z. Sztankóová ◽  
J. Kyselová ◽  
V. Zink ◽  
M. Štípková ◽  
...  
Keyword(s):  
Milk Production ◽  
Low Density Lipoprotein ◽  
Density Lipoprotein ◽  
Breeding Value ◽  
Production Traits ◽  
Milk Production Traits ◽  
Heterogeneous Effects ◽  
Reproduction Traits ◽  
Estimated Breeding Value ◽  
The Impact

The impact of polymorphism of the diacylglycerol acyltransferase (DGAT1), butyrophilin (BTN1A1), oxidized low-density lipoprotein receptor (OLR1), and signal transducer and activator of transcription 1 (STAT1) genes on milk production and reproduction traits in 419 Czech Fleckvieh cows was examined using polymerase chain reaction and restriction fragment length polymorphism. The loci DGAT1 and BTN1A1 were observed simultaneously to affect milk production, estimated breeding value of milk production traits, as well as reproduction parameters. Significant differences were found also between genotypes of the STAT1 loci in relation to estimated breeding value of milk production traits. Similar findings in pure dairy breeds suggest that heterogeneous effects of the observed loci can be explained by different genetic backgrounds in various breed populations selected to achieve different commercial goals. Thus, it is necessary to determine variability and influence of a molecular marker in a specific population when considering its inclusion into a breeding programme. &nbsp;

Prediction Breeding Value and Genetic Parameter in Iranian Holstein Bulls for Milk Production Traits

2007 ◽  
Vol 11 (1) ◽  
pp. 108-112 ◽  
Author(s):  
Mojtaba Hosseinpour Mashhadi ◽  
Naser Emam Jomeh Kash ◽  
Mohammad Reza Nassiry ◽  
Rasol Vaez Torshizi
Keyword(s):  
Milk Production ◽  
Genetic Parameter ◽  
Breeding Value ◽  
Production Traits ◽  
Milk Production Traits ◽  
Holstein Bulls

scholarly journals Effect of leptin gene polymorphism on the breeding value of milk production traits in Iranian Holstein

animal ◽  
2008 ◽  
Vol 2 (7) ◽  
pp. 999-1002 ◽  
Author(s):  
M. Sadeghi ◽  
M. Moradi Shahr Babak ◽  
G. Rahimi ◽  
A. Nejati Javaremi
Keyword(s):  
Gene Polymorphism ◽  
Milk Production ◽  
Breeding Value ◽  
Production Traits ◽  
Milk Production Traits

scholarly journals Estimation of the breeding value and ranking of holstein-friesian bulls for milk production traits

2018 ◽  
Vol 24 (2) ◽  
pp. 32-38
Author(s):  
Miloš Marinković ◽  
Nenad Mićić ◽  
Marina Lazarević ◽  
Vlada Pantelić ◽  
Predrag Perišić ◽  
...  
Keyword(s):  
Milk Production ◽  
Breeding Value ◽  
Production Traits ◽  
Milk Production Traits ◽  
Holstein Friesian

scholarly journals Relationships of growth hormone gene and milk protein polymorphisms to milk production traits in Simmental cattle

1997 ◽  
Vol 64 (1) ◽  
pp. 47-56 ◽  
Author(s):  
MOHAMMED FALAKI ◽  
ALBERTO PRANDI ◽  
CESARE CORRADINI ◽  
MYRIAM SNEYERS ◽  
NICOLAS GENGLER ◽  
...  
Keyword(s):  
Growth Hormone ◽  
Gene Polymorphism ◽  
Milk Production ◽  
Restriction Enzyme ◽  
Milk Protein ◽  
Breeding Value ◽  
Production Traits ◽  
Milk Production Traits ◽  
Gh Gene ◽  
Protein Polymorphisms

The importance of milk proteins and the positive effect of administration of growth hormone (GH) on milk production, and the presence in some dairy cattle lines of greater GH concentrations prompted us to examine the presence of restriction fragment length polymorphism at the GH gene using the restriction enzyme TaqI and to investigate associations between this polymorphism in Simmental cows and bulls, as well as milk protein variants in Simmental cows, and milk production traits. Blood and milk were sampled from 279 Italian Simmental cows and semen was collected from 148 bulls of the same breed. Two fragment bands, denoted A and B, of 6200 and 5200 bp respectively, were examined and three patterns, AA, AB and BB, were found in both animal samples. All variants previously reported in other studies, for κ, β, and αs1-caseins, and β-lactoglobulin, were found in the cows' samples. For the cows' samples, a BLUP (Best Linear Unbiased Predictor) analysis of results was performed using a REML (Restricted Maximum Likelihood) program and known heritabilities, whereas for bulls we have performed a General Linear Model analysis. The effect of GH gene polymorphism, using TaqI restriction enzyme, on milk production traits was not significant, but bulls of BB pattern had a higher breeding value for milk yield than AA bulls (P<0·05). For the κ-casein genotypic effects, cows of AB genotype gave milk with 1·53±0·70 g/kg less fat than cows of AA genotype. In addition, breeding values for milk protein content were significantly higher in BB bulls, with 0·87±0·32 and 0·71±0·34 g/kg more milk protein than AA and AB bulls respectively. Thus, our results revealed a GH gene polymorphism and indicated significant effects of milk protein polymorphisms on milk production traits in the Italian Simmental breed.

scholarly journals Short Communication: Effect of Leptin Gene Polymorphisms on Breeding Value for Milk Production Traits

2004 ◽  
Vol 87 (11) ◽  
pp. 3925-3927 ◽  
Author(s):  
Z. Madeja ◽  
T. Adamowicz ◽  
A. Chmurzynska ◽  
T. Jankowski ◽  
J. Melonek ◽  
...  
Keyword(s):  
Milk Production ◽  
Gene Polymorphisms ◽  
Short Communication ◽  
Breeding Value ◽  
Production Traits ◽  
Milk Production Traits ◽  
Communication Effect

Effect of Breed and Some Non - Genetic Factors on Milk Production and Some Proportions of Its Chemical Components in Two Breeds of Local Sheep

2020 ◽  
Vol 10 (1) ◽  
pp. 227-231
Author(s):  
Rahman Hussein AL-Qasimi ◽  
Shatha Mohammed Abbas ◽  
Allawi L.D. AL-Khauzai
Keyword(s):  
Milk Production ◽  
Genetic Factors ◽  
Chemical Components ◽  
Lactation Period ◽  
Production Traits ◽  
Milk Production Traits ◽  
Fat Percentage ◽  
Awassi Sheep ◽  
Total Milk ◽  
Milk Components

The study was carried out on 19 ewes of local Awassi sheep and 12ewes local Arabi sheep in the Al-kafeel sheep station Karbala, to determine the effect of breed and some non-genetic factors such as (sex of the lamb, type of birth, age and weight of ewes at birth) on daily and total milk production and lactation period and some of milk components (fat, protein and lactose). The results showed that a significant effect (P <0.05) of the breed on milk production traits where Awassi sheep recorded the highest mean (0.91 kg , 101.63 kg , 104.86 day) compared to the Arabi sheep she was means (0.77 kg , 88.15 kg , 99.15 day) respectively. As well as in proportions of milk components with mean( 5.1 , 4.90 , 5.51) % respectively compared to the Arabi sheep (4.70 . 4.20 . 4.89) ewes with male lambs also exceeded superior ewes with female lambs in daily and total milk production and the lactation period the sex of the lamb did not affect the proportions of milk components the weight of the ewes had a significant effect (P <0.05) in milk production attributes with superior weight of ewes on lower ewes and did not affect the proportions of milk ingredients except for lactose. The type of birth and the age of the ewes did not have a significant effect in all the studied traits except for the superiority (P<0.05) of young ewes on age ewes in the fat percentage of milk.

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