Selection indexes for production traits of Canadian dairy sires

1992 ◽  
Vol 72 (3) ◽  
pp. 477-491 ◽  
Author(s):  
J. P. Gibson ◽  
N. Graham ◽  
E. B. Burnside
Keyword(s):  
Milk Production ◽  
Economic Value ◽  
Production Traits ◽  
Single Index ◽  
Highly Efficient ◽  
Pricing System ◽  
Milk Volume ◽  
Multiple Component ◽  
Selection Indexes ◽  
Efficiency Of Selection

It would be of benefit to the dairy industry to have sires evaluated for the net economic value of their genetic potential for milk-production traits. Economic weights and selection indexes were derived for a variety of production circumstances, taking into account all returns and costs of dairy production and allowing for the existence of quotas. A single index designed for the average farmer in Ontario under a multiple-component pricing system was highly efficient (>98% of maximum gains) for most situations. Changes in pricing of milk caused the largest changes in the index. An index based on the current volume payment with fat correction would cause a 24% loss in efficiency of selection if protein eventually becomes twice the price of fat. A single index was proposed as highly efficient for farmers across Canada irrespective of their production circumstances, provided payment for milk is based on a multiple-component pricing system giving roughly equal value to fat and protein and low value to milk volume. Key words: Selection indexes, economics, milk production, sire selection

scholarly journals  Impact of economic parameters on economic values in dairy sheep

2013 ◽  
Vol 58 (No. 1) ◽  
pp. 21-30 ◽  
Author(s):  
Z. Krupová ◽  
E. Krupa ◽  
M. Wolfová
Keyword(s):  
Milk Production ◽  
Litter Size ◽  
Functional Traits ◽  
Milk Yield ◽  
Growth Traits ◽  
Economic Value ◽  
Production Traits ◽  
Economic Values ◽  
Economic Parameters ◽  
The Impact

The impact of variation in economic conditions on the economic values of fourteen production and functional traits was examined for the Improved Valachian breed using a bio-economic model implemented in the ECOWEIGHT software. The following economic parameters were investigated: market prices of lambs, milk, and cheese (variation ± 40%), costs for roughage, concentrates, and total feeding rations , costs for labour and veterinary care, fixed costs (variation ± 20% for all costs), and discount rate of revenues and costs (0 and 3%). Results of the analyses were presented in detail for the marginal and relative economic values of the four most important traits: milk yield in the 150-day milking period, conception rate of ewes, litter size per lambed ewe, and productive lifetime of ewes. Furthermore, cumulative relative economic values of the four trait complexes – milk production, growth, functional, and wool traits – were presented. Prices for sheep products were found to be the most important factor for both the marginal and the relative economic values of the evaluated traits. The four traits with the highest relative economic values in the base calculation stayed the most important for all investigated economic parameters ranges. The relative economic values of the remaining 10 traits did not exceed 6.1%. The relative economic values of milk yield and litter size were the most sensitive to the variation in economic circumstances. For the investigated range of economic parameters, the relative economic value for the complex of milk production traits ranged 30.6–48.1%, for growth traits 6.3–9.4%, and that for functional traits 45.4–59.7%. The relative economic value for the wool trait did not exceed 0.3%.

scholarly journals A Capra Hircus Chromosome 19 Locus Linked to Milk Production Influences Mammary Conformation

2021 ◽  
Author(s):  
Andrew Jiang ◽  
Alex Ankersmit-Udy ◽  
Sally-Anne Turner ◽  
Megan Scholtens ◽  
Mathew D Littlejohn ◽  
...  
Keyword(s):  
Milk Production ◽  
Genome Wide Association Study ◽  
Negative Relationship ◽  
Production Traits ◽  
Milk Production Traits ◽  
Chromosome 19 ◽  
Dairy Goats ◽  
Genome Wide ◽  
Goat Population ◽  
Milk Volume

Abstract Background: Economically important milk production traits including milk volume, milk fat and protein yield vary considerably across dairy goats in New Zealand. A significant portion of the variation is attributable to genetic variation. Discovery of genetic markers linked to milk production traits can be utilised to drive selection of high-performance animals.A previously reported genome wide association study across dairy goats in New Zealand identified a quantitative trait loci (QTL) located on chromosome 19. The most significantly associated single nucleotide polymorphism (SNP) marker for this locus is located at position 26,610,610 (SNP marker 19:26,610,610). This locus is associated with multiple milk production traits including fat, protein and volume. The predicted effect of selection for the beneficial haplotype would result in an average production increase of 2.2kg fat, 1.9kg protein and 73.6kg volume.An outstanding question was whether selection for the beneficial allele would co-select for any negative pleiotropic effects. An adverse relationship between milk production and udder health traits has been reported at this locus. Therefore, a genome wide association study was undertaken looking for loci associated with udder traitsResults: The QTL and production associated marker 19:26,610,610 was identified in this study to also be associated with several goat udder traits including udder depth (UD), fore udder attachment (FUA) and rear udder attachment (RUA). Our study replicates the negative relationship between production and udder traits with the high production allele at position 19:26,610,610 associated with an adverse change in UD, FUA and RUAConclusions: Our study has confirmed this negative relationship between udder traits and production traits in the NZ goat population. We have found that the frequency of the high production allele is relatively high in the NZ goat population, indicating that its effect on udder conformation is not significantly detrimental on animal health. It will however be important to monitor udder conformation as the Chromosome 19 locus is progressively implemented for marker assisted selection. It will also be of interest to determine if the gene underlying the production QTL has a direct effect on mammary gland morphology or whether the changes observed are a consequence of the increased milk volume.

scholarly journals Expected genetic responses from selection indexes for Canadian dairy cattle under present and future milk pricing systems

1998 ◽  
Vol 78 (2) ◽  
pp. 157-165 ◽  
Author(s):  
B. Sivanadian ◽  
M. M. Lohuis ◽  
J. C. M. Dekkers
Keyword(s):  
Net Present Value ◽  
Economic Value ◽  
Term Selection ◽  
Pricing System ◽  
Total Economic Value ◽  
Large Herd ◽  
Selection Indexes ◽  
Genetic Responses ◽  
Sire Selection

Expected selection responses and profit under alternative milk pricing scenarios for various selection indexes were compared: Lifetime Profit Index (LPI) with 60:40:0:0 emphasis on production:type:herdlife:somatic cell score and 9:2:0 relative weights on Protein:fat:milk, and Total Economic Value (TEV) reflecting the present pricing system, Neutral Total Economic Value (NTEV) and Future Total Economic Value (FTEV) reflecting future milk prices, each with 64:0:26:10 emphasis on production:type:herdlife:somatic cell score and 9:2:0, 1:0:0 and 18:–2:–5 relative weights, respectively, on protein:fat:milk and Large Herd Operator Index (LHO) with 83:17:0:0 emphasis and 13.5:–1.5:0 relative weights. Among the correlations between indexes the lowest was.93 (correlation of LPI with NTEV and FTEV) and the highest was 0.99 (between TEV and NTEV). For present and probable future milk pricing the most profitable sire selection indexes were TEV and FTEV in both whole and grade-only populations. When selection intensity and number of daughters per sire were equal to 1.0 and 50, respectively, profit expressed in Canadian dollars in net present value of lifetime profit of a milking daughter were 231.75 (226.62 in grade population) and 234.89 (229.89 in grade population) from TEV and FTEV respectively. The choice of sire selection indexes depends on individual farmer goals. However, if the total economic merit resulting from typical dairy production is the goal, then TEV and FTEV are advised for short-term and long term selection, respectively. Key words: Index, selection, genetic response, profit, milk pricing

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.

An association analysis between PRL genotype and milk production traits in Italian Mediterranean river buffalo

2017 ◽  
Vol 84 (4) ◽  
pp. 430-433 ◽  
Author(s):  
Jun Li ◽  
Aixin Liang ◽  
Zipeng Li ◽  
Chao Du ◽  
Guohua Hua ◽  
...  
Keyword(s):  
Milk Production ◽  
Milk Yield ◽  
Milk Fat ◽  
Fat Content ◽  
Phenotypic Variance ◽  
River Buffalo ◽  
Production Traits ◽  
Milk Production Traits ◽  
Exon 2 ◽  
Mediterranean River

This Research Communication describes the association between genetic variation within the prolactin (PRL) gene and the milk production traits of Italian Mediterranean river buffalo (Bufala mediterranea Italiana). High resolution melting (HRM) techniques were developed for genotyping 465 buffaloes. The association of genetic polymorphism with milk production traits was performed and subsequently the effects of parity and calving season were evaluated. Single nucleotide polymorphisms (SNPs) were identified at exons 2 and 5 and at introns 1 and 2. All the SNPs were in Hardy–Weinberg equilibrium, and statistical analysis showed that the polymorphism of intron1 was significantly (P < 0·05) associated with milk yield, milk protein content and peak milk yield. The average contribution of the intron1 genotype (r2intron1) to total phenotypic variance in milk production traits was 0·09, and the TT genotype showed lower values than CC and CT genotypes. A nonsynonymous SNP was identified in exon 2, which resulted in an amino acid change from arginine to cysteine. Moreover, the polymorphism of exon 2 was associated significantly with milk fat content (P < 0·05), and the buffaloes with TT genotype showed higher total fat content than the buffaloes with CT genotype. These findings provide evidence that polymorphisms of the buffalo PRL gene are associated with milk production traits and PRL can be used as a candidate gene for marker-assisted selection in Italian Mediterranean river buffalo breeding.

Factors influencing milk osteopontin concentration based on measurements from Danish Holstein cows

2021 ◽  
pp. 1-6
Author(s):  
Brian Christensen ◽  
Elias D. Zachariae ◽  
Nina A. Poulsen ◽  
Albert J. Buitenhuis ◽  
Lotte B. Larsen ◽  
...  
Keyword(s):  
Milk Production ◽  
Bovine Milk ◽  
Farm Management ◽  
Holstein Cows ◽  
Enzyme Linked Immunosorbent Assay ◽  
Production Traits ◽  
Milk Production Traits ◽  
Factors Influencing ◽  
Significant Interest ◽  
Variation Explained

Abstract Our objective was to determine the content of the bioactive protein osteopontin (OPN) in bovine milk and identify factors influencing its concentration. OPN is expressed in many tissues and body fluids, with by far the highest concentrations in milk. OPN plays a role in immunological and developmental processes and it has been associated with several milk production traits and lactation persistency in cows. In the present study, we report the development of an enzyme linked immunosorbent assay (ELISA) for measurement of OPN in bovine milk. The method was used to determine the concentration of OPN in milk from 661 individual Danish Holstein cows. The median OPN level was determined to 21.9 mg/l with a pronounced level of individual variation ranging from 0.4 mg/l to 67.8 mg/l. Breeding for increased OPN in cow's milk is of significant interest, however, the heritability of OPN in milk was found to be relatively low, with an estimated value of 0.19 in the current dataset. The variation explained by the herd was also found to be low suggesting that OPN levels are not affected by farm management or feeding. Interestingly, the concentration of OPN was found to increase with days in milk and to decrease with parity.

scholarly journals Sequence Variations in the Bovine Growth Hormone Gene Characterized by Single-Strand Conformation Polymorphism (SSCP) Analysis and Their Association with Milk Production Traits in Holsteins

Genetics ◽  
1996 ◽  
Vol 144 (4) ◽  
pp. 1809-1816 ◽  
Author(s):  
Jianbo Yao ◽  
Samuel E Aggrey ◽  
David Zadworny ◽  
J Flan Hayes ◽  
Urs Kühnlein
Keyword(s):  
Growth Hormone ◽  
Milk Production ◽  
Milk Yield ◽  
Single Strand Conformation Polymorphism ◽  
Sscp Analysis ◽  
Bovine Growth Hormone ◽  
Production Traits ◽  
Milk Production Traits ◽  
Sequence Variations ◽  
Conformation Polymorphism

Sequence variations in the bovine growth hormone (GH) gene were investigated by single strand conformation polymorphism (SSCP) analysis of seven amplified fragments covering almost the entire gene (2.7 kb). SSCPs were detected in four of these fragments and a total of six polymorphisms were found in a sample of 128 Holstein bulls. Two polymorphisms, a T→C transition in the third intron (designated GH4.1) and an A→C transversion in the fifth exon (designated GH6.2), were shown to be associated with milk production traits. GH4.1c/GH4.1c bulls had higher milk yield than GH4.1c/GH4.1t (P ≤ 0.005) and GH4.1t/GH4.1t (P ≤ 0.0022) bulls. GH4.1c/GH4.1c bulls had higher kg fat (P ≤ 0.0076) and protein (P ≤ 0.0018) than GH4.1c/GH4.1t bulls. Similar effects on milk production traits with the GH6.2 polymorphism were observed with the GH6.2a allele being the favorable allele. The average effects of the gene substitution for GH4.1 and GH6.2 are similar, with ±300 kg for milk yield, ±8 kg for fat content and ±7 kg for protein content per lactation. The positive association of GH4.1c and GH6.2a with milk production traits may be useful for improving milk performance in dairy cattle.

scholarly journals Domperidone and maternal milk volume in mothers of premature newborns

2017 ◽  
Vol 57 (1) ◽  
pp. 18 ◽  
Author(s):  
Tengku Ellya Fazilla ◽  
Guslihan Dasa Tjipta ◽  
Muhammad Ali ◽  
Pertin Sianturi
Keyword(s):  
Placebo Group ◽  
Breast Milk ◽  
Milk Production ◽  
Controlled Trial ◽  
Maternal Milk ◽  
Premature Newborns ◽  
Breast Milk Production ◽  
Days Of Therapy ◽  
Significant Difference ◽  
Milk Volume

Background Mothers of premature newborns often have difficulty giving adequate breast milk volume to their infants. Domperidone is an antagonist of peripheral dopamine receptors and believed to increase breast milk production. In Indonesia, no study has been done to date on the effect of domperidone on maternal milk production in mothers of premature newborns.  Objective To evaluate the effect of domperidone on milk production in mothers of premature newborns who failed to lactate.Methods A randomized controlled trial was conducted from July to December 2012 in the Perinatology Unit, Haji Adam Malik Hospital, Medan. Mothers of premature newborns were given lactation counseling for 7 days in order to increase their milk production. Mothers who failed to lactate after that time were enrolled in the study. Fifty subjects were assigned to receive either domperidone or a placebo for 7 days. Milk volume was measured every 2 hours (from 7 am to 9 pm), in the 24 hours before starting therapy, and on the 7th and 10th days (the 10th day being 3 days after stopping therapy). Results This study involved 25 mothers in the domperidone groups and 25 others in placebo group. After 7 days of therapy, mean breast milk volume was significantly higher in the domperidone group than in the placebo group  [181.6 (SD 80.2) vs. 72.4 (SD 57.8) mL, respectively; 95%CI of differences 69.36 to 148.93; P=0.0001]. At day 10, breast milk production remained significantly higher in the domperidone group. Furthermore, in the domperidone group, no significant difference in mean breast milk volumes was noted between the 7th and 10th days (P=0.65). Conclusion In mothers of premature newborns who failed to lactate, domperidone therapy for 7 days causes significantly higher milk production compared to placebo. 

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