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Full-Text Articles in Beef Science
Selecting For Less: How Much Methane Can We Truly Breed Away?, Sean B. Crowley
Selecting For Less: How Much Methane Can We Truly Breed Away?, Sean B. Crowley
ORBioM (Open Research BioSciences Meeting)
Background
Genetic selection has potential to reduce enteric methane emissions from cattle, but a key challenge is determining how much of the genetic variation in methane traits is independent of traits already targeted in breeding programs, such as feed intake and growth.
Methods
Methane and carbon dioxide emissions were recorded in 1,700 crossbred, indoor-fed beef cattle using Greenfeed systems. Performance data included feed intake, metabolic liveweight, average daily gain, carcass weight, and ultrasound and skeletal traits. Genetic parameters and correlations among traits were estimated using animal linear mixed models to quantify the independence of methane-related genetic variation.
Results
Daily methane …
Characterisation Of Sex Chromosome Aneuploidy In Female Cattle Using Genotype Information, Cliona Ryan
Characterisation Of Sex Chromosome Aneuploidy In Female Cattle Using Genotype Information, Cliona Ryan
ORBioM (Open Research BioSciences Meeting)
Background
Aneuploidy is a genetic condition characterized by the loss (monosomy) or gain (trisomy) of one or more chromosomes. Aneuploidy affecting the sex chromosomes often leads to infertility. The objective of this study was to estimate the prevalence of sex chromosome aneuploidy in a large juvenile population using routinely available genotype intensity information.
Methods
Genotype and genotype intensity data was available on 145,476 female dairy and beef cattle below 15 months of age at the time of genotyping, with no recorded progeny. Genotype intensity data included the LogR Ratio (LRR), R-value (the sum of X and Y SNP probe intensities), …
Grass-Based Supplementation To Reduce Slaughter Age In Dairy-Beef Steers, Jamie O'Driscoll
Grass-Based Supplementation To Reduce Slaughter Age In Dairy-Beef Steers, Jamie O'Driscoll
ORBioM (Open Research BioSciences Meeting)
Background
Reducing slaughter age, while maintaining carcass output, will improve the sustainability of beef production systems. This will result in lower lifetime emissions from cattle, while also reducing the carbon equivalent per kilogram of beef carcass. The objective of this study was to investigate the strategic use of concentrate feed within pasture-based dairy-beef steer production systems, to establish its effectiveness in reducing slaughter age in differing animal genotypes.
Methods
Three contrasting supplementation strategies were implemented: 1) grass only (GO), pasture only diet in the first and second grazing season, 2) intermediate (INTER), concentrate supplementation throughout the first grazing season, pasture …
Clearing The Air Between Methane And Commercial Beef Cattle In Ireland, Clodagh V. Ryan
Clearing The Air Between Methane And Commercial Beef Cattle In Ireland, Clodagh V. Ryan
ORBioM (Open Research BioSciences Meeting)
Background
Rumen methanogenesis is the single most significant source of anthropogenic methane (CH4) emissions. This research aimed to analyse CH4 data recorded by GreenFeed systems by assessing the repeatability of such phenotypic measures, estimating the heritability of CH4, and generating CH4 estimated breeding values (EBVs) for inclusion in the national breeding index.
Methods
CH4 measurements were recorded on 979 cattle for 20 to 83 days using GreenFeed machines, resulting in 211,136 individual CH4 observations. The phenotypic repeatability of CH4 was estimated for six different averaging periods using a linear mixed …
Genetic Variations In The Myostatin Gene Among Irish Cattle Breeds, Cliona Ann Ryan
Genetic Variations In The Myostatin Gene Among Irish Cattle Breeds, Cliona Ann Ryan
ORBioM (Open Research BioSciences Meeting)
No abstract provided.
Mining Of Producer Recorded Data; Using Beef Calf And Cow Live-Weight Data As A Case Study, Shauna Walsh
Mining Of Producer Recorded Data; Using Beef Calf And Cow Live-Weight Data As A Case Study, Shauna Walsh
ORBioM (Open Research BioSciences Meeting)
Animal live-weight contributes to profitability in beef herds and is a key determinant of overall efficiency of the beef sector. The objective was to develop a novel editing criteria for anomaly detection of beef cow and calf live-weight data. Live-weight data from five sources (i.e., professionally-recorded, owned-scales, borrowed-scales, scales hired from a depot, other) were available from the Irish Cattle Breeding Federation.
A number of alternative methods were used for anomaly detection including: generation of within-herd regression estimates, partial correlations between cow and calf live-weight records and mahalanobis distance. Across each method a value was calculated for each herd based …
A Student Hosted Cattle Sale As An Approach To Experiential Learning, Wade Lang, Courtney Biles
A Student Hosted Cattle Sale As An Approach To Experiential Learning, Wade Lang, Courtney Biles
Undergraduate Research Conference
OBJECTIVE: The objective of this study was to determine if a student hosted cattle sale resulted in a beneficial learning experience and if a 30-day reflection period would change student perspective.