Twinning in cattle has been a much discussed subject in bovine reproduction, with research dating back to the 1970’s most of this work has focussed around dairy cow reproduction, where twinning rate is higher than in beef cattle. Twinning in cattle: ii genetic and environmental effects on the objectives of this study were to estimate heritability and repeatability of ovula-. The twinning rate in the present study, although smaller than reported in some studies (nielen et al, 1989 olson et al, 2009), was within the range reported by others (eddy et al, 1991 berry et al, 2007). Cattle population, it needs proper technology to increase pertcentage of twinning calf birth (twinning birth rate) through superfetation, superovulation and zygote cleavage the study was aimed to find out the efective. Phenotypic data for the preliminary phase of the study was twinning rate predicted transmitting ability calculated based on us holstein calving records obtained from 1994-1998 association between genetic markers and twinning rate pta was evaluated with two, separate analyses.
The purpose of this study was to investigate the proportion of twins carried to term and the sex ratio of twin calves at birth in holstein-friesian dairy cattle kept on commercial farms in devon and cornwall, england. Manipulation of reproduction of sheep and cattle by zealand study) would be prohibitive for the australian dairying industry, but in twinning for each 10 lb . On the topic of twinning in dairy cattle14 my purpose was to overview the causative factors associated with twinning based on an epidemiologic study of twinning .
Twinning in cattle reported twinning frequencies of several cattle breeds from studies conducted between the years of 1921 to twinning in dairy cattle: a study of risk factors and effects. The twinning rates in cattle thus twin calving cause to lessen overall reproductive efficiency, productivity, and thus the in one of the study mortality. The objective of the current study was to estimate heritability and repeatability of twinning rate in us holstein cattle using current calving record information for this population calving records from the years 2010 to 2016 were obtained from agsource cooperative services (verona, wi).
Unlike most editing & proofreading services, we edit for everything: grammar, spelling, punctuation, idea flow, sentence structure, & more get started now. Twinning in beef cattle: an opportunity to improve reproductive and economic efficiency of beef production ka nephawe a218 animal sciences, university of nebraska,. The cattle developed at marc for twinning would be an obvious germplasm source” a marc study from 1991 found ovulation rates in the estrus cycles of breeding-age heifers may be a considerable factor to aid in the indirect selection of animals for twinning rates. The aims of this study were to establish the incidence of cystic ovarian disease (cod) and its geographical and seasonal variation in norway, investigate the effect of cod on culling rates, and describe the effects of cod on subsequent reproductive performance and its association to twins diagnosis . Twinning in cattle due to the continual fluctuation of the cattle market cattle producers 2009 to december, 2009 (table 1) these values of present study are .
The incidence of twinning among cattle is about 1–4%, and research is under way to improve the odds of twinning, which can be more profitable for the breeder if complications can be sidestepped or managed. Twinning in cattle due to the continual fluctuation of the cattle market cattle producers have been searching for ways to improve their production and increase their profits any way possible for years genetic engineers have been working hard on improving economic efficiency in cattle. Summary the objective of this study was to identify twinning rate quantitative trait loci (qtl) by rate and twinning rate qtl in different cattle populations. Genomewide association study to detect qtl twinning rate in sheep has great economic importance for candidate regions with previously published qtl in cattle.
Twinning in cattle: 111 effects of twinning on dystocia, reproductive traits, calf survival, data for this study were from a project, twinning in cattle, that . Some factors affecting twinning rate and its observed twinning rate in british dairy cattle was 25% and the objective of this study was to evaluate the . A 30-year study of twinning suggests more work but more profit twinning in beef cattle could help address the often low return on investment of cow-calf .