Model calculations for the optimal planning of beef performance tests using a german dual-purpose cattle population as an example

1985 ◽  
Vol 13 (3) ◽  
pp. 229-250 ◽  
Author(s):  
H.-U. Graser ◽  
E. Niebel ◽  
D. Fewson
Keyword(s):  
Optimal Planning ◽  
Performance Tests ◽  
Cattle Population ◽  
Dual Purpose ◽  
Model Calculations ◽  
Dual Purpose Cattle

Efficiency of nucleus breeding schemes in dual-purpose cattle of Tanzania

1990 ◽  
Vol 50 (2) ◽  
pp. 245-251 ◽  
Author(s):  
J. S. Kasonta ◽  
G. Nitter
Keyword(s):  
Artificial Insemination ◽  
Genetic Gain ◽  
Cattle Breed ◽  
Progeny Testing ◽  
Environment Interaction ◽  
Dual Purpose ◽  
Model Calculations ◽  
Dual Purpose Cattle ◽  
Total Profit ◽  
Breeding Schemes

ABSTRACTFor the Mpwapwa cattle breed in Tanzania, the efficiency of various breeding schemes including an open nucleus was investigated by model calculations. Artificial insemination and intensive recording of production are assumed to be applied in a nucleus which is the main breeding unit. As a pre-nucleus, associated herds with less intense data recording serve as the basis to screen superior cows for nucleus replacements, provide the capacity for progeny testing, and operate as bull multipliers for commercial herds.The criteria of efficiency were genetic gain and profit from selection for a dual purpose breeding objective (milk and beef) in a total population of 10 000 cows. Introducing a two breeding tier scheme through separating all recorded cows into a nucleus and pre-nucleus leads to an increase of the genetic gain rather than the profit. Further improvement is obtained by introduction of artificial insemination in pre-nucleus herds. The nucleus size should not exceed about 5% of the cow population and an optimum size of the pre-nucleus is about 15%. Opening the nucleus to replacement cows coming from the pre-nucleus affects the aggregate genetic gain very little although it can be recommended if milk yield is to be mainly improved or if the total profit is taken into account. Furthermore, the nucleus should be opened if there is little difference between the heritabilities in the nucleus and pre-nucleus and also in order to avoid detrimental effects of inbreeding and genotype × environment interaction.

BREEDING AND GENETIC PARAMETERS IN RUSSIAN DUAL-PURPOSE CATTLE POPULATION

2019 ◽  
pp. 63-70
Author(s):  
S. Kharitonov ◽  
◽  
A. Sermyagin ◽  
L. Ignatieva ◽  
E. Melnikova ◽  
...  
Keyword(s):  
Genetic Parameters ◽  
Cattle Population ◽  
Dual Purpose ◽  
Dual Purpose Cattle

scholarly journals Selection of Simmental cattle on beef and meatiness traits in Serbia

2005 ◽  
Vol 21 (3-4) ◽  
pp. 25-34 ◽  
Author(s):  
Vladan Bogdanovic ◽  
Radica Djedovic ◽  
Milan Petrovic
Keyword(s):  
Cattle Population ◽  
Selection Methods ◽  
Dual Purpose ◽  
Dual Purpose Cattle ◽  
Beef Herds ◽  
Simmental Cattle ◽  
Selection For ◽  
Breed Selection ◽  
Selection Of ◽  
Made In

Population of domestic Simmental breed represents a dominant population of cattle in Serbia. According to importance of this breed, selection so far has been made in order to improve milk production. In other hand, beef and meatiness traits almost were ignored. Selection of dual-purpose cattle requires combining a various breeding goals and selection methods that are very differ from those applied in pure dairy or beef herds. Improving of beef and meatiness traits in our dominant cattle population will have great importance in future. The aim of this paper is to show possibility of selection for beef and meatiness traits in Serbian Simmental cattle.

scholarly journals Ecological total merit index for an Austrian dual purpose cattle breed

2001 ◽  
Vol 44 (1) ◽  
pp. 5-14 ◽  
Author(s):  
R. Baumung ◽  
J. Sölkner ◽  
E. Gierzinger ◽  
A. Willam
Keyword(s):  
Milk Production ◽  
Functional Traits ◽  
Cattle Breed ◽  
Production Traits ◽  
Dual Purpose ◽  
Economic Values ◽  
Model Calculations ◽  
Ecological Index ◽  
Dual Purpose Cattle ◽  
The Impact

Abstract. Organic farming plays a considerable role in Austrian agriculture. Therefore it seems to be worthwhile to make suggestions about a more ecological breeding goal for cattle breeds. Because of the fact that Simmental is the most frequent dual purpose cattle breed in Austria, this breed is chosen to show the impact of selection under an ecological total merit index. With model calculations the effect on selection response in milk production beef production and functional traits under selection with the current economic total merit index and more ecological index variants, e.g. with higher economic values for fitness and functional traits, is shown. As a basis for future decisions the efficiency of more or less ecological indices is compared. The results indicate that an increase of the current economic values of functional traits of about 50 percent does not present a great risk, expected selection responses for milk production traits are still high.

Economic Optimisation of the Breeding Structure within a Dual-purpose Cattle Population

1974 ◽  
Vol 24 (3) ◽  
pp. 247-258 ◽  
Author(s):  
P. H. Petersen ◽  
L. Gj⊘l Christensen ◽  
B. Bech Andersen ◽  
E. Ovesen
Keyword(s):  
Cattle Population ◽  
Dual Purpose ◽  
Breeding Structure ◽  
Dual Purpose Cattle

scholarly journals Genetic relationship between type traits, number of lactations initiated, and lifetime milk performance in Czech Fleckvieh cattle

2017 ◽  
Vol 62 (No. 12) ◽  
pp. 501-510 ◽  
Author(s):  
L. Novotný ◽  
J. Frelich ◽  
J. Beran ◽  
L. Zavadilová
Keyword(s):  
Body Size ◽  
Milk Production ◽  
Genetic Relationship ◽  
Genetic Correlations ◽  
Bivariate Analysis ◽  
Dual Purpose ◽  
Lifetime Performance ◽  
Dual Purpose Cattle ◽  
Type Traits ◽  
Milk Performance

Genetic relationship was analyzed between type traits and longevity measures in dual-purpose cattle. Data from 91 486 Czech Fleckvieh cows first calved between 2003 and 2009 were used. Longevity was defined as the actual number of lactations initiated per cow and also as functional longevity, which incorporated an adjustment to account for variation in voluntary culling based upon milk production. Lifetime performance was defined as cumulative milk production through the 6<sup>th</sup> parity. All cows were scored for conformation traits during their first lactation. Genetic correlations between these traits and longevity measures were estimated by bivariate analysis using the DMU variance component program package. Type trait heritabilities ranged from 0.30 to 0.59, while heritabilities for longevity and functional longevity were 0.06 and 0.05, respectively. Heritability of lifetime performance was 0.08. Genetic correlations between type traits and longevity measures ranged from low to intermediate values. Genetic correlations of the measured body size traits to the real and functional longevity ranged from –0.06 to –0.29, for udder traits from –0.02 to 0.33, and for foot and leg traits from –0.03 to 0.17. Genetic correlations between the measured body size traits and lifetime performance ranged from –0.03 to –0.30, for udder traits from 0.05 to 0.47, for foot and leg traits from –0.07 to 0.15. Genetic correlations of composite trait scores for frame, muscularity, feet and legs, and udder with longevity traits ranged from –0.20 to 0.41 and for lifetime performance –0.14 to 0.51. The highest genetic correlations between a type trait and functional longevity were for composite udder score (0.25), feet and legs (0.26), and udder depth (0.33), suggesting that these traits could serve as indicators of functional longevity. We conclude that selection based upon easily and inexpensively measured type traits could improve functional longevity of cows as well as lifetime milk production.

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