Type Appraisal: III. Relationships of First Lactation Production and Type Traits with Lifetime Performance

Norman, H.D.; Vleck, L.D. Van

doi:10.3168/jds.s0022-0302(72)85750-3

Cited by 60 publications

(9 citation statements)

References 21 publications

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“…Various definitions of longevity or herdlife have been used in several studies, e. g. average age at disposal (H oque and H odges 1981; M c A llister et al 1987), number of lactations initiated in the herd beginning from first lactation (M iller et al 1967; H argrove et al 1969; N orman et al 1972; N orman et al 1981). Productive life has been defined in most studies as the difference between date of first calving and date of disposal.…”

Section: Introductionmentioning

confidence: 99%

Genetic parameters of lifetime performance traits in Holstein cows

Chauhan

Hayes

Jairath

1993

J Animal Breeding Genetics

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Heritabilities, genetic and phenotypic correlations among lifetime yields of milk, fat and protein, herdlife, productive life and number of lactations initiated in the herd were estimated from records of 44,933 progeny of 427 young and 119 proven Holstein sires in 1949 herds using a multivariate Reml technique to fit a sire model with relationships among young sires. Proven sires were fitted as fixed effects. Heritabilities of lifetime traits ranged from 0.005 to 0.030, suggesting little scope for direct selection for lifetime performance traits. Productive life had highest genetic correlation with lifetime fat yield (0.934), but correlations with lifetime milk and protein yields were smaller and similar (0.773 and 0.772). The number of lactations also had highest genetic correlation with lifetime fat yield. ZUSAMMENFASSUNG: Genetische Parameter von Lebensleistungsmerkmalen bei Holsteinkühen Heritabilitätswerte, genetische und phänotypische Korrelationen zwischen Lebensleistungsmerkmalen für Milch, Fett und Protein, Lebensdauer, produktive Zeit und Zahl Laktationen wurden won 44933 Nachkommen von 427 jungen und 119 nachkommenschaftsgeprüften Holsteinstieren in 1949 Herden mittels einer multivariablen REML-Technik geschätzt, die auf einem Vatertiermodell mit Verwandtschaft zwischen den jungen Stieren beruhte. Geprüfte Stiere wurden als fixe Effekte im Modell berücksichtigt. Heritabilitätswerte dieser Merkmale rangieren von 0.005 bis 0.03, so daß wenig Aussichten für Erfolg direkter Selektion auf Lebensleistungsmerkmale besteht. Die Länge des produktiven Lebens hatte die höchste genetische Korrelation mit Lebensfettmenge (0.934), aber die Korrelationen mit Milch- und Protein-Lebensleistung waren kleiner und ähnlich (0.773 und 0.772). Die Zahl der Laktationen hatte die höchste genetische Korrelation mit der Lebensfettmenge.

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Section: Introductionmentioning

confidence: 99%

Genetic parameters of lifetime performance traits in Holstein cows

Chauhan

Hayes

Jairath

1993

J Animal Breeding Genetics

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“…Most previous studies have shown low correlations between type traits and herd life (3,5). In 1961 a type appraisal project was initiated by the Extension Division of the Department of Animal Science of the New York State College of Agriculture to study these problems.…”

Section: Introductionmentioning

confidence: 99%

Association of Type Traits with Reasons for Disposal

Vleck

Norman

1972

Journal of Dairy Science

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Reasons for disposal of 3,475 cows from 188 New York Holstein herds were compared with type appraisal and milk yield in first lactation to study the relationship between type traits measured early in life and later reasons for disposal. Reasons for disposal were grouped as production (325), udder (22~), reproduction (27%), inabilities or disease (8~), workability (3~), type (3~;), and other (55). Few traits measured before 49 mgnths of age had any significant value in predicting the reason for a cow's eventual disposal. These results in addition to earlier studies of heritability suggest that type traits measured in the first lactation have only a limited value in selection for longevity.

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“…It must be noted that these relationships are affected by the voluntary culling rather than health per se. Norman and Van Vleck (1972) examined relationships of first lactation type ratings under the Cornell type Appraisal System and first lactation production with lifetime producing ability. Of the first lactation variables, milk yield had the highest correlation with lifetime milk (0.34) and fat yield had the highest correlation with number of lactations (0.21).…”

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confidence: 99%

Relationships of early performance traits to lifetime profitability in Holstein cows

Kulak¹,

Dekkers²,

McAllister³

et al. 1997

Can. J. Anim. Sci.

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. 1997. Relationships of early performance traits to lifetime profitability in Holstein cows. Can. J. Anim. Sci. 77: 617-624. Relationships of first lactation traits to lifetime profitability were studied based on data of 1112 lifetime performance records of purebred Holstein cows from the National Cooperative Dairy Cattle Breeding Project, which was implemented by Agriculture Canada in 1972. Lifetime profit was defined based on milk production, body weight, reproductive performance, herdlife, and prices for feed energy, milk, calves, salvage value, and fixed costs. First lactation traits with significant relationships to lifetime profitability were identified using the backward elimination procedure for least squares. Relative weights of each prediction trait were expressed as standard partial regression coefficients. Milk revenue in first lactation was the most important trait, followed by 3 min yield, and udder height. First lactation survival was found to be significant. Increasing age at first calving, number of days from first breeding to conception in first lactation, and teat diameter had significant negative effects on profit. Health traits in first lactation were not significant. The significant traits explained 35% of total variation in lifetime profitability. Nous avons étudié les rapports des caractères de performance en première lactation avec la rentabilité à vie à partir des données consignées sur 1 112 relevés de production à vie de vaches Holstein de sang inscrites au Projet coopératif canadien d'amélioration des bovins laitiers mis en place en 1972 par le ministère de l'Agriculture du Canada. La rentabilité à vie prenait en compte la production laitière, le poids corporel, les performances de reproduction, la vie du troupeau, les veaux, la valeur de récupération et les charges fixes. Les caractères de performance en 1 e lactation donnant des rapports significatifs avec la rentabilité à vie étaient dégagés par élimination régressive. Les pondérations de chaque caractère de prédiction étaient exprimées comme coefficients de régression partielle standards. Le produit du lait en 1 e lactation était le caractère le plus important, suivi du rendement après 3 mn de traite et de la hauteur d'attache des tétines. Le taux de survie à la 1 e lactation s'avérait significatif. Le report de l'âge au premier vêlage, l'intervalle première mise à la reproduction-conception en 1 e lactation et le diamètre des tétines avaient des effets négatifs significatifs sur la rentabilité. Les caractères d'ordre sanitaire en 1 e lactation n'étaient pas significatifs. Les caractères significatifs justifiaient 35 % de la variation totale de la rentabilité à vie. Mots clés: Vache laitière, rentabilité à vie, indicateur précoceProfitability of individual cows can be regarded as the breeding objective in dairy cattle. This trait is a function of production, length of productive life, reproductive performance, as well as health and management aspects. Kulak et al. (1997) studied lifetime profitability measures of dairy cows and ...

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Type Appraisal: III. Relationships of First Lactation Production and Type Traits with Lifetime Performance

Cited by 60 publications

References 21 publications

Genetic parameters of lifetime performance traits in Holstein cows

Genetic parameters of lifetime performance traits in Holstein cows

Association of Type Traits with Reasons for Disposal

Relationships of early performance traits to lifetime profitability in Holstein cows

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