Genetic Relationship Between Days Open and Days Dry With Milk Yield in a Herd of Holstein Friesian Cattle

1998 ◽  
Vol 2 (1) ◽  
pp. 60-64
Author(s):  
Hulya Atil
Keyword(s):  
Milk Yield ◽  
Genetic Relationship ◽  
Holstein Friesian ◽  
Days Open ◽  
Friesian Cattle

scholarly journals Genetic relationship between days open and days dry with milk yield in a herd of Holstein Friesian cattle

2000 ◽  
Vol 43 (6) ◽  
pp. 583-590
Author(s):  
H. Atil
Keyword(s):  
Milk Production ◽  
Milk Yield ◽  
Genetic Relationship ◽  
Genetic Influence ◽  
Regression Coefficients ◽  
Quadratic Regression ◽  
Holstein Friesian ◽  
Days Open ◽  
Partial Linear ◽  
Friesian Cattle

Abstract. A total of 2897 lactation records of Holstein Friesian cattle from the fields of Dena Farm in Egypt from 1987 to 1993 were used to study relationships of days open and days dry with milk production. The effect of month and year of calving, sire and cow within sires were also investigated. Month of calving, year of calving, sire and cow within sires significantly influenced milk production. Including DO and DP as a polynomial of second degree of production were significant. The partial linear and quadratic regression coefficients of 305 day milk yield on DO and DP were significant, being 7.59 ± 0.40 kg/d and −0.37 ± 0.00 kg/d2, respectively for DO and −9.37 ± 0.54 kg/d and 0.02 ± 0.00 kg/d2, respectively for DP. Therefore, reduction of DO and DP are a desirable goal of dairymen. Heritability (h2) estimates for 305 day milk yield, DO, DP were 0.13 ± 0.05, 0.00 and 0.00, respectively. Adjustment of lactation milk yield for DO will not involve genetic influence on milk yield.

THE EFFECTS OF DAYS DRY AND DAYS OPEN ON THE MILK AND BUTTERFAT PRODUCTION OF HOLSTEIN-FRIESIAN CATTLE

1967 ◽  
Vol 47 (1) ◽  
pp. 85-90 ◽  
Author(s):  
J. W. Wilton ◽  
E. B. Burnside ◽  
J. C. Rennie
Keyword(s):  
Milk Production ◽  
Milk Yield ◽  
Holstein Friesian ◽  
Dairy Animals ◽  
Days Open ◽  
Friesian Cattle ◽  
Selection Of

The effect of days dry and days open on first, second and later lactation production was examined by intra-sire-herd-season regression. Neither variation in days dry nor days open accounted for more than 1% of the within-sire variance in fat test. Variation in preceding days dry accounted for 4.8% of the within-sire variance in milk production in second lactations but only 0.6% of the variance in later lactations. Differences in days open accounted for 4.5, 3.5, and 4.5% of the intra-sire variance in milk production in first, second, and later lactations, respectively. The effects of days dry and days open on fat production were, in all cases, slightly less than the effects on milk production. Heritabilities for both traits were low, indicating that the effects of both days dry and days open on production were largely of an environmental nature. Adjustment of milk yield for the number of days cows are open could lead to more accurate selection of dairy animals.

Relationships among udder type traits and milk yield of Iranian Holstein-Friesian cattle

2003 ◽  
Vol 2003 ◽  
pp. 141-141
Author(s):  
M. R. Sanjabi ◽  
M. G. Govindaiah ◽  
M. M. Moeini
Keyword(s):  
Milk Production ◽  
Milk Yield ◽  
Genetic Correlations ◽  
Holstein Friesian ◽  
Type Traits ◽  
High Production ◽  
Friesian Cattle

Correlation among type traits and with milk production has been investigated by Brotherstone (1994) and Misztal et al (1992). One of the primary reasons for collecting and utilizing information on type traits is to aid breeders in selecting profitable functional cows for high production and suitable herd life. The objectives of this study were to estimate phenotypic and genetic correlations among milk production and with udder traits.

scholarly journals A comparison of different methods of estimating sire transmitting ability of some milk traits in a herd of Holstein Friesian cattle

2000 ◽  
Vol 43 (2) ◽  
pp. 115-122
Author(s):  
H. Atil ◽  
A. S. Khattab
Keyword(s):  
Least Squares ◽  
Milk Yield ◽  
Lactation Period ◽  
Milk Traits ◽  
Linear Unbiased Prediction ◽  
Age At First Calving ◽  
Holstein Friesian ◽  
Genetic And Phenotypic Correlations ◽  
Best Linear Unbiased ◽  
Friesian Cattle

Abstract. A total of 1931 normal first lactation records of Holstein Friesian cows kept at Dena Farm in Egypt during the period from 1987 to 1994 were used to estimate phenotypic and genetic parameters for 90 day milk yield (90 dMY), 305 day milk yield (305 dMY) and lactation period (LP). In addition, 76 bulls with at least ten daughters were used to compare three methods of sire transmitting ability. A least Squares analysis of variance show significant effect of month and year of calving and age at first calving for different traits studied, except the effect of age at first calving on LP. Heritability estimates for 90 dMY, 305 dMY and LP were 0.39 ± 0.08, 0.27 ± 0.07 and 0.14 ± 0.05, respectively. Genetic and phenotypic correlations between different traits were positive and significant. Sires with at least ten daughters were evaluated by best linear unbiased prediction (BLUP), least Squares means (LSM) and regression of the future daughters mean on the present daughters mean. The product moment correlations between different traits studied were positive and high (= 0.96).

scholarly journals Season of birth is associated with first-lactation milk yield in Holstein Friesian cattle

animal ◽  
2017 ◽  
Vol 11 (12) ◽  
pp. 2252-2259 ◽  
Author(s):  
M. Van Eetvelde ◽  
M.M. Kamal ◽  
L. Vandaele ◽  
G. Opsomer
Keyword(s):  
Milk Yield ◽  
Season Of Birth ◽  
Holstein Friesian ◽  
Friesian Cattle

Genetic parameters of beef characters and the genetic relationship between meat and milk production in British Friesian cattle

1972 ◽  
Vol 14 (2) ◽  
pp. 135-148 ◽  
Author(s):  
I. L. Mason ◽  
V. E. Vial ◽  
R. Thompson
Keyword(s):  
Milk Yield ◽  
Genetic Relationship ◽  
Genetic Parameters ◽  
Genetic Correlations ◽  
Carcass Composition ◽  
Standard Errors ◽  
Fat Percentage ◽  
Selection For ◽  
Friesian Cattle ◽  
Weight For Age

SUMMARYA beef progeny test was organized for 66 British Friesian bulls standing at AI centres in England. Eighty-one progeny groups averaging 8-5 steers each were reared on the farms of various co-operating organizations and their growth and carcass characters were recorded. Heritability of various measurements of gain varied from 0 to 0·34, of carcass conformation measures from 0·24 to 0·50, of muscle and fat percentage in the rib joint was 0·58 and 0·46 respectively, of other measures of fatness varied from 0·04 to 0·18, of weight of feet was 0·4 and of weight of hide 0·5.Phenotypic correlations among beef characters gave no indication that carcass composition could be predicted from the external carcass measurements or subjective scores used in this study. Genetic correlations suggested that selection for weight for age would produce a fatter and more compact carcass. Genetic correlations were high and negative between milk yield (contemporary comparison) and weight for age, carcass weight/length, and blockiness of leg, and high and positive between milk yield, and carcass depth/length and percentage bone in the rib joint. Their standard errors were also high.

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