Výsledky vyhledávání - "R. C. Handcock"

Growth, milk production, reproductive performance, and stayability of dairy heifers born from 2-year-old or mixed-age dams

Autor: Penny Back, Rebecca Hickson, Nicolas Lopez-Villalobos, R. C. Handcock, McNaughton Lr

Publikováno v: Journal of Dairy Science. 104:11738-11746

Keeping replacement heifers that were the progeny of primiparous cows mated by artificial insemination enhances rates of genetic gain. Previous research has shown that heifers that were the progeny of primiparous cows were lighter at birth and grew a

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7ee98dd70af634bf5691888cea06de2f
https://doi.org/10.3168/jds.2021-20354

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Increased yearling weight as a proportion of 21-month weight was associated with increased milk production in dairy heifers

Autor: Grant Edwards, Penny Back, Nicolas Lopez-Villalobos, Rebecca Hickson, McNaughton Lr, R. C. Handcock

Publikováno v: New Zealand Veterinary Journal. 68:272-282

Aims: To examine the relationship between liveweight (LWT) at 12 months as a proportion of LWT at 21 months of age (LWT(12/21)%) and first lactation and cumulative 3-year milk production in dairy heifers in New Zealand. Methods: Liveweight and milk p

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ba62cf260dd519c036c5c468880656d1
https://doi.org/10.1080/00480169.2020.1750498

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Linear versus seasonal growth of dairy heifers decreased age at puberty but did not affect first lactation milk production

Autor: Rebecca Hickson, C. M. C. Jenkinson, Nicolas Lopez-Villalobos, McNaughton Lr, Richard Laven, R. C. Handcock, Penny Back

Publikováno v: New Zealand Journal of Agricultural Research. 64:83-100

The aim of this study was to compare conformation, age at puberty and subsequent milk production of Holstein–Friesian–Jersey crossbred heifers grown in a linear trajectory (Target; n = 55) between ...

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::8892956e2baeac288bbff58145f41dbc
https://doi.org/10.1080/00288233.2019.1607404

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Heifers with positive genetic merit for fertility traits reach puberty earlier and have a greater pregnancy rate than heifers with negative genetic merit for fertility traits

Autor: Ken G. Dodds, R. C. Handcock, Chris R. Burke, P.R. Beatson, P. R. Amer, McNaughton Lr, J.R. Bryant, Richard J. Spelman, John R Roche, Susanne Meier

Publikováno v: Journal of dairy science. 104(3)

This study investigated the hypothesis that dairy heifers divergent in genetic merit for fertility traits differ in the age of puberty and reproductive performance. New Zealand's fertility breeding value (FertBV) is the proportion of a sire's daughte

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a4c343b749c344de519a01d7bf3acfe8
https://pubmed.ncbi.nlm.nih.gov/33455798

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Live weight and growth of Holstein-Friesian, Jersey and crossbred dairy heifers in New Zealand

Autor: Nicolas Lopez-Villalobos, R. C. Handcock, McNaughton Lr, Penny Back, Grant Edwards, Rebecca Hickson

Publikováno v: New Zealand Journal of Agricultural Research. 62:173-183

The objective of this study was to model the growth of dairy heifers to estimate the effects of breed and heterosis on live weight (LWT) and growth from three to 22 months of age. Data comprised of 1,653,214 LWT records obtained from 189,936 dairy he

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::71409abed30a3d24f59860f68a6f6c64
https://doi.org/10.1080/00288233.2018.1465984

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Body weight of dairy heifers is positively associated with reproduction and stayability

Autor: McNaughton Lr, R. C. Handcock, Penny Back, Nicolas Lopez-Villalobos, Rebecca Hickson, Grant Edwards

Publikováno v: Journal of dairy science. 103(5)

This study investigated the relationships between body weight (BW) and stayability, and BW and calving pattern, of 189,936 New Zealand dairy heifers. Heifers were classified into 5 breed groups: Holstein-Friesian (F), Holstein-Friesian crossbred (FX)

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::41fc61c80425edcf7ddbd523e0e6cc17
https://pubmed.ncbi.nlm.nih.gov/32113762

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Positive relationships between body weight of dairy heifers and their first-lactation and accumulated three-parity lactation production

Autor: Nicolas Lopez-Villalobos, R. C. Handcock, Rebecca Hickson, Penny Back, Grant Edwards, McNaughton Lr

Publikováno v: Journal of dairy science. 102(5)

This study investigated the relationships between body weight (BW) and milk production of 140,113 New Zealand dairy heifers. Heifers were classified into 5 breed groups: Holstein-Friesian, Holstein-Friesian crossbred, Jersey, Jersey crossbred, and Ho

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e3b0ca607ee07370cd16fcb585d92ed4
https://pubmed.ncbi.nlm.nih.gov/30827540

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