scholarly journals Estimation of Genetic Parameters for Lameness Trait and Its Relationship with Milk Production Traits in Iranian Holstein Cows

2018 ◽  
Vol 8 (17) ◽  
pp. 93-98
Author(s):  
Sheida Varkoohi ◽  
Meisam Shilanan ◽  
Saheb Forotanifar ◽  
Alireza Eghbal
Keyword(s):  
Milk Production ◽  
Genetic Parameters ◽  
Holstein Cows ◽  
Production Traits ◽  
Milk Production Traits ◽  
Estimation Of Genetic Parameters

scholarly journals Genetic parameters for female fertility and milk production traits in first-parity Czech Holstein cows

2012 ◽  
Vol 57 (No. 3) ◽  
pp. 108-114 ◽  
Author(s):  
V. Zink ◽  
J. Lassen ◽  
M. Štípková
Keyword(s):  
Milk Production ◽  
Genetic Parameters ◽  
Selection Index ◽  
Female Fertility ◽  
Holstein Cows ◽  
Production Traits ◽  
Milk Production Traits ◽  
Clear Trend ◽  
Genetic Potential ◽  
Fertility Traits

The aim of this study was to estimate genetic parameters for female fertility and production traits in first-parity Czech Holstein cows and to quantify the effect of using this information on the accuracy of a selection index in seven different scenarios. In order to estimate genetic (co)variance components, the DMU software running an AI-REML algorithm was used. The analyses were made using a series of bivariate animal models. The pedigree included 164 125 animals and it was set up using a pruned animal model design. The present study included the following female fertility traits for the first lactations: calving to the first insemination (CF), days open (DO), calving from the first to the last insemination (FL), and milk production traits: milk production (MLK), kg of fat (FAT), and kg of protein (PROT). The heritability for all the investigated fertility traits was low and close to 0. Moderate heritabilities for production traits ranging from 0.20 (MLK) to 0.23 (PROT) were estimated. The strongest unfavourable correlation was found between PROT and DO (0.49). Other estimated correlations between fertility traits and production traits were moderate, ranging from 0.26 to 0.41. The results of this study evidence that cows with the poorest genetic potential for reproductive performance are those having high genetic potential for milk production and milk components. The results also show that the number of days from calving to new pregnancy depends on the production level. Seven investigated scenarios using selection index theory show a clear trend for increasing accuracy when more fertility traits were added as well as when higher numbers of daughters with information on reproduction traits per sire were available.  

scholarly journals Estimation of Genetic Parameters for Milk Production Traits in Holstein Dairy Cattle

2013 ◽  
Vol 55 (1) ◽  
pp. 7-11 ◽  
Author(s):  
Chungil Cho ◽  
Kwanghyeon Cho ◽  
Yunho Choy ◽  
Jaekwan Choi ◽  
Taejeong Choi ◽  
...  
Keyword(s):  
Dairy Cattle ◽  
Milk Production ◽  
Genetic Parameters ◽  
Production Traits ◽  
Milk Production Traits ◽  
Estimation Of Genetic Parameters

scholarly journals Estimation of genetic parameters for productive life, reproduction, and milk-production traits in US dairy goats

2014 ◽  
Vol 97 (4) ◽  
pp. 2462-2473 ◽  
Author(s):  
V.J. Castañeda-Bustos ◽  
H.H. Montaldo ◽  
G. Torres-Hernández ◽  
S. Pérez-Elizalde ◽  
M. Valencia-Posadas ◽  
...  
Keyword(s):  
Milk Production ◽  
Genetic Parameters ◽  
Production Traits ◽  
Milk Production Traits ◽  
Dairy Goats ◽  
Productive Life ◽  
Estimation Of Genetic Parameters

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.

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