Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

Tytuł pozycji:

Pure-breeding with sexed semen and crossbreeding with semen of double-muscled sires to improve beef production from dairy herds: Factors affecting heifer and cow fertility and the sex ratio.

Tytuł:
Pure-breeding with sexed semen and crossbreeding with semen of double-muscled sires to improve beef production from dairy herds: Factors affecting heifer and cow fertility and the sex ratio.
Autorzy:
Bittante G; Department of Agronomy, Food, Natural Resources, Animals and Environment (DAFNAE), University of Padova (Padua), 35020 Legnaro (PD), Italy.
Negrini R; Department of Animal Science, Food and Nutrition (DIANA), Catholic University, 29122 Piacenza, Italy; Italian Association of Breeders (AIA), 00161 Rome, Italy.
Bergamaschi M; Department of Animal Science, North Carolina State University, Raleigh 27695.
Cecchinato A; Department of Agronomy, Food, Natural Resources, Animals and Environment (DAFNAE), University of Padova (Padua), 35020 Legnaro (PD), Italy. Electronic address: .
Toledo-Alvarado H; Department of Genetics and Biostatistics, National Autonomous University of Mexico, Ciudad Universitaria, 04510, Mexico City, Mexico.
Źródło:
Journal of dairy science [J Dairy Sci] 2020 Jun; Vol. 103 (6), pp. 5246-5257. Date of Electronic Publication: 2020 Apr 16.
Typ publikacji:
Journal Article
Język:
English
Imprint Name(s):
Publication: Champaign, IL : American Dairy Science Association
Original Publication: Lancaster, Pa. [etc.]
MeSH Terms:
Fertility*
Hybridization, Genetic*
Sex Ratio*
Animal Husbandry/*methods
Cattle/*physiology
Sex Preselection/*veterinary
Animals ; Dairying ; Female ; Male ; Semen
Contributed Indexing:
Keywords: X-sorted semen; beef cross; dairy breed; heat stress on fertility; replacement heifer
Entry Date(s):
Date Created: 20200421 Date Completed: 20200925 Latest Revision: 20200925
Update Code:
20240104
DOI:
10.3168/jds.2019-17932
PMID:
32307168
Czasopismo naukowe
Using sexed semen to produce purebred replacement heifers makes it possible to mate a large proportion of dairy cows to double-muscled sires and to quantitatively and qualitatively improve beef production and increase the income from dairy herds. Net profit first depends on changes in the farm's overall fertility rate. The objective of this study was to analyze the conception rate in herds using a combination of conventional dairy semen (for pure- and crossbreeding), X-sorted dairy semen (to produce purebred replacement heifers), and conventional beef semen (for terminal crossbreeding). Data were obtained from 50,785 inseminations of 15,580 dairy cows (78% Holstein-Friesian, 15% Brown Swiss, 2% Simmental, and 5% crossbreds) from 106 dairy farms (average milk yield 35.1 ± 9.4 kg/d, with 3.76 ± 0.83% fat and 3.32 ± 0.39% protein contents). To account for the main potential confounders, we used separate generalized linear mixed-effects models for cows and virgin heifers. The results showed that the odds ratio of conception improved (1.00 to 1.34) with an increase in the average milk yield of the herd but worsened (1.12 to 0.70) with an increase in the milk yield of individual cows within herd. The summer months showed a strong reduction in the odds ratio of conception in cows (0.56 in July and August) but not in virgin heifers. Multiparous cows had a lower odds ratio of conception (0.85) than primiparous cows (1.00). The order of insemination did not affect the fertility of the cows or heifers, whereas the odds ratio of conception improved with advancing lactation (1.00 to 2.12). The Simmental cows were more fertile than Holstein-Friesians (1.37 vs. 1.00), whereas the fertility of the heifers was not affected by breed. Taking all these possible confounders into account simultaneously, in pure-breeding the odds ratio of conception using sexed semen did not differ from that using conventional dairy semen in cows (0.90 vs. 1.00) or in virgin heifers (0.95 vs. 1.00). However, crossbreeding using conventional beef and dairy semen improved the odds ratio of conception (1.10 and 1.17, respectively) in cows (1.37 using beef semen) and heifers (1.25 using dairy semen). The proportion of newborn heifer calves was ≥90% using sexed dairy semen. The combined use of sexed semen, especially on heifers, to produce purebred replacement females and beef semen to produce terminal crossbred calves was shown to have the potential to increase overall herd fertility, which could be further improved using sexed dairy semen to produce dairy crossbreds instead of purebred replacement heifers.
(Copyright © 2020 American Dairy Science Association. Published by Elsevier Inc. All rights reserved.)

Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies