Results 21 to 30 of about 11,071 (289)

Ages at Calving and Calving Intervals for Dairy Cattle in the United States

Journal of Dairy Science, 1989
Abstract Calving ages and intervals for cows first calving in 1966 to 1986 were examined for five dairy cattle breeds. For parities one through seven, mean age at each parity was lowest for Jerseys and highest for Ayrshires and Brown Swiss. Registered cows usually were older than grades for a specific parity.
Nieuwhof, G.J., Powell, R.L., Norman, H.D.   +2 more
openaire   +1 more source

Genetic evaluation of fertility using direct and correlated traits [PDF]

, 2003
Poor fertility has become a major reason for involuntary culling of dairy cows in the United Kingdom. Calving interval (CI) and body condition score (BCS) are recorded, heritable, genetically correlated with each other, and could be used to extend the ...
Coffey, M.P., G. Banos, J.A. Woolliams, S. Brotherstone, Banos, Georgios, Wall, E; id_orcid, Brotherstone, S., Wall, E., Woolliams, JA, Coffey, MP, E. Wall, Woolliams, John, Brotherstone, S, Banos, G; id_orcid, M.P. Coffey   +14 more
core   +1 more source

Researches Regarding the Influence of Calving Interval on the Number of Somatic Cells during Lactation in Romanian Black and White Cows

Scientific Papers Animal Science and Biotechnologies, 2023
The aim of this paper was to study the influence of calving interval on the number of somatic cells from milk in Romanian Black and White cows. The study was conducted on a total of 125 lactations from 92 cows.
Simona Baul, Ludovic Toma Cziszter, Stelian Acatincăi, Traian Cismaș, Dinu Gavojdian, Iulian Tripon, Silvia Erina, George Gabriel Răducan   +7 more
doaj  

Analysis of non-genetic factors affecting calving difficulty in the Czech Holstein population

Czech Journal of Animal Science, 2008
The objective of this study was to analyze the effects of non-genetic factors affecting calving difficulty in the Holstein population of the Czech Republic for subsequent compilation of the model for genetic evaluation as well as for herd management ...
M. Fiedlerová, D. Řehák, M. Vacek, J. Volek, J. Fiedler, P. Šimeček, O. Mašata, F. Jílek   +7 more
doaj   +1 more source

Factors Affecting Calving Interval in Italian Holstein-Friesian Heifers [PDF]

, 1989
Effect of rump conformation on calving interval of 520 Italian Holstein Friesian heifers was evaluated with simultaneous adjustment for herd, year of birth, calving month, age at first parturition, and milk production.
Pedron O., Tedesco D., Giuliani G., Rizzi R.   +3 more
core   +1 more source

Reproductive qualities of dairy cows at different levels of milk yield

Аграрная наука Евро-Северо-Востока, 2021
The article presents the results of the analysis of the reproductive ability of cows depending on the level of their milk productivity. The studies were conducted in the Republic of Mari El on cows of the Holstein black-and-white breed (n = 3828).
Svetlana V. Titova
doaj   +1 more source

Calculation of multiple-trait sire reliability for traits included in a dairy cattle fertility index [PDF]

, 2004
The advent of genetic evaluations for fertility traits in the UK offers valuable information to farmers that can be used to control fertility problems and safeguard against involuntary culling.
Coffey, M.P., Coffey, M. P., Thompson, R., Banos, Georgios, Wall, E; id_orcid, Brotherstone, S., Wall, E., Woolliams, JA, Thompson, R, Coffey, MP, Banos, G., Woolliams, J. A., Woolliams, John, Banos, G; id_orcid, Brotherstone, S   +14 more
core   +1 more source

Desempeño reproductivo de vacas Gyr lechero en un sistema a pastoreo del trópico ecuatoriano

La Técnica: Revista de las Agrociencias, 2020
Reproductive performance of Gyr dairy cows in a grazing system of the Ecuadorian Tropic Resumen El objetivo del trabajo fue evaluar la eficiencia reproductiva en vacas lecheras Gyr en condiciones de pastoreo del trópico ecuatoriano.
Alicia Esther Farfán Talledo, Wilter Fernando Borja Veloz, Luis Santiago Quiroz Fernández, Juan José Zambrano Villacís, Pablo Roberto Marini   +4 more
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Trends in milk production, calving rate and survival of cows in 14 Irish dairy herds as a result of the introgression of Holstein-Friesian genes

, 2006
peer-reviewedTrends in milk production, calving rates, and survival were monitored on a potential 5580 primiparous and multiparous Holstein-Friesian dairy cows across 14 Irish seasonal spring-calving dairy farms between the years 1990 and 2001. Over this
V. Ducrocq, P. Dillon, Garrick, Dorian J., F. Buckley, D. P. Berry, D. J. Garrick, Dillon, Pat, M. Wallace, R. D. Evans, Evans, R. D., Ducrocq, V., Buckley, Frank, Wallace, Michael, Berry, Donagh   +13 more
core   +1 more source

The Influence of Synthetic Analogues of PgF2 on the Evolution of Puerperal Period and the Duration of the Interval from Calving to the First Estrus in Cows

Scientific Papers Animal Science and Biotechnologies, 2023
Puerperal period is the most critical period from the productive life of females, at the borderline between physiologic and pathologic. In this stage some reproductive turbulence may appear (uterine subinvolution, uterine infections, ovary inactivity ...
Nicolae Păcală, Casiana Șipețan, Ioan Bencsik, Dorel Dronca, Ada Cean, Ion Carabă, Marioara Nicula, Marinel Șipețan, Nenad Nedeljkovic, Cosmin Ganță   +9 more
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