To estimate the heritability (h2) of postrigor calpastatin activity (CA), 555 steers were reared and processed conventionally. Breed-types included purebreds (Angus [A], Braunvieh [B], Charolais [C], Gelbvieh [G], Hereford [H], Limousin [L], Pinzgauer [P], Red Poll [RP], and Simmental [S]), composite populations (MARC I [1/4 C, 1/4 B, 1/4 L, 1/8 H, 1/8 A], MARC II [1/4 S, 1/4 G, 1/4 H, 1/4 A], and MARC III [1/4 RP, 1/4 H, 1/4 P, 1/4 A]), and F1 crosses (H, A, C, G, P, Shorthorn, Galloway, Longhorn, Nellore, Piedmontese, or Salers x H or A). Steers were serially slaughtered on an age-constant (across breed groups) basis. Heritability estimates for CA, i.m. fat content (IMF), Warner-Bratzler shear (WBS) force, retail product yield (RPY), and ADG were .65 +/- .19, .93 +/- .02, .53 +/- .15, .45 +/- .18, and .32 +/- .26, respectively. The genetic correlations (rg) of CA with WBS, RPY, and ADG were .50 +/- .22, .44 +/- .25, and -.52 +/- .37, respectively. The rg of IMF with WBS, RPY, and ADG were -.57 +/- .16, -.63 +/- .15, and -.04 +/- .11, respectively. These h2 and rg estimates indicate that it should be possible to select for improvements in CA, IMF, and WBS. However, selection against CA may be a more suitable approach for improving meat tenderness than selection for increased IMF because the level of genetic antagonism between CA and RPY was not as great as that between IMF and RPY.

Heritabilities and phenotypic and genetic correlations for bovine postrigor calpastatin activity, intramuscular fat content, Warner-Bratzler shear force, retail product yield, and growth rate

https://calidadcarnecita.files.wordpress.com/2012/06/livestock-science-114-19e2809330.pdf

Live weight, body size and carcass characteristics of young bulls of fifteen European breeds

Animal models of placental angiogenesis.

Cattle are our most important livestock species because of their production and role in human culture. Many breeds that differ in appearance, performance and environmental adaptation are kept on all inhabited continents, but the historic origin of the diverse phenotypes is not always clear. We give an account of the history of cattle by integrating archaeological record and pictorial or written sources, scarce until 300 years ago, with the recent contributions of DNA analysis. We describe the domestication of their wild ancestor, migrations to eventually all inhabited continents, the developments during prehistory, the antiquity and the Middle Ages, the relatively recent breed formation, the industrial cattle husbandry in the Old and New World and the current efforts to preserve the cattle genetic resources. Surveying the available information, we propose three main and overlapping phases during the development of the present genetic diversity: (i) domestication and subsequent wild introgression; (ii) natural adaptation to a diverse agricultural habitat; and (iii) breed development.

On the history of cattle genetic resources

Pre-pubertal and postpartum anestrus in tropical Zebu cattle

reviewed from the cattle Germ Plasm Evaluation Program at the tsUlts are S Meat Animal Research Center comparing performance of top-L. Hruska U~ breeds. The variation that exists in biological traits bY 20 sir f roduction is vast and under a high degree of genet ic for b~~ca~t genetic change can result from 1) select ion among breeds, • Signi eeding to exploit heterosis and 3) selection within breeds. f cros~:rrange for differences between breed means vary from 2.5 to 6.3 of t dard deviations (op) and exceed 40p for most traits. The range pic stan between breed means is approximately equal to the expected range dlrrerence\ es of individuals within breeds (60g) for most growth, carcass, Dree ding ~~e~nal characteristics studied. Heterosis effects are important, rt .nd ~ 8S large «.50P) as the range for additive genetic differences nelr Y Use of genetic diversity between and within breeds with 1) bre~~~sbreeding, 2) rotational-terminal-sire crossbreeding systems and te populations to improve efficiency of beef production in temperate zones is discussed.

/pdf/genetic-diversity-among-cattle-breeds-and-its-use-to-3iwfjm0kf8.pdf

Genetic Diversity Among Cattle Breeds and Its Use to Increase Beef Production Efficiency in a Temperate Environment

A Genetic Analysis of Maturing Patterns in Straightbred and Crossbred Hereford, Angus and Shorthorn Cattle

Heterosis for Maturing Patterns in Hereford, Angus and Shorthorn Cattle

/pdf/breed-effects-and-retained-heterosis-for-growth-carcass-and-18wht1h16e.pdf

Breed effects and retained heterosis for growth, carcass, and meat traits in advanced generations of composite populations of beef cattle

/pdf/heterosis-and-breed-maternal-and-transmitt-ed-effec-ts-in-2bt0p22g3i.pdf

Heterosis and Breed Maternal and Transmitt ed Effec ts in Beef Cattle

Handle everyday research tasks with reliable, citation-backed results

Your personal Research Agent to handle research tasks with citation-backed results

Popular Tasks used by Researchers

How can I help with your research?

Meet SciSpace

Get more enhanced response by uploading the PDFs you want me to reference.

No relevant PDFs in your library

SciSpace is the AI research assistant for academics. Run systematic literature reviews on 280M+ papers, and write papers with cited sources. Trusted by 1M+ students, PhDs & researchers.

SciSpace | AI for Research

Analyze PDFs

Code & Manuscripts

Funding & Grants

Literature & Patents

Medical & Clinical Data

Systematic Review

Visualize & Present

Web & Data

Build a Google Scholar-like website for your research.

Build a website

Create charts and images for your research

Create a Chart

Write a paper for submission to a journal

Draft a manuscript

Patent Search

Design eye-catching scientific posters in minutes.

Scientific Poster Generation

Systematic Literature Review

One task is running at the moment. Your messages will be shown right after.

Drag and drop or click here to browse

Loved by <highlight>1 million+</highlight> researchers

Extract a list of specific topics and their sources from unstructured text

Topics

Compare and analyze relevant papers that matches with your search

Papers

Get insights from PDFs and bookmarked papers from your library

My library

Recent searches

Try searching for:

Catch AI-generated content in scholarly and non-scholarly content

{ai} Detector

Ai Writer

Get PDF Summaries, highlighted text explanations 

Chat with PDF

Effortlessly create in-text citations and bibliographies in APA and 2,500 other formats

Citation generator

Get explanations, summaries, and answers on academic papers

Ease up your research workflow with {scispace}'s cohort of exciting AI tools

Elevate your academic writing skills and convey your ideas the way you want

Paraphraser

Explore our range of reading and writing tools

Your file is being prepared and should be ready in a few minutes. If it's a large file, it might take a bit longer. You can close this window, and we'll email you the file when it's done.

You have reached a maximum limit of <strong>{limit}</strong> columns in the table. Remove at least <strong>1</strong> column to add or create another one.

Keith E. Gregory

Author Tools

Chat about Author