Mark McGee
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View article: PSIX-30 Interaction between rumen microbiome and host feed efficiency phenotype across contrasting breeds and dietary sources
PSIX-30 Interaction between rumen microbiome and host feed efficiency phenotype across contrasting breeds and dietary sources Open
Provision of feed accounts for a high proportion of the variable cost in beef production systems, and consequently is a major determinant of overall profitability. Thus, improving the conversion of feed to animal product by identifying and…
View article: Methane prediction equations including genera of rumen bacteria as predictor variables improve prediction accuracy
Methane prediction equations including genera of rumen bacteria as predictor variables improve prediction accuracy Open
Methane (CH 4 ) emissions from ruminants are of a significant environmental concern, necessitating accurate prediction for emission inventories. Existing models rely solely on dietary and host animal-related data, ignoring the predicting p…
View article: Temperate pasture- or concentrate-beef production systems: steer performance, meat nutritional value, land-use, food–feed competition, economic and environmental sustainability
Temperate pasture- or concentrate-beef production systems: steer performance, meat nutritional value, land-use, food–feed competition, economic and environmental sustainability Open
The objective was to evaluate steer performance, meat nutritional value, land-use, food–feed competition and both economic and environmental sustainability within temperate pasture-based suckler weanling-to-beef systems with or without (fo…
View article: Effect of breed and diet on the M. longissimus thoracis et lumborum transcriptome of steers divergent for residual feed intake
Effect of breed and diet on the M. longissimus thoracis et lumborum transcriptome of steers divergent for residual feed intake Open
Improving cattle feed efficiency through selection of residual feed intake (RFI) is a widely accepted approach to sustainable beef production. A greater understanding of the molecular control of RFI in various breeds offered contrasting di…
View article: Intake, Growth and Carcass Traits of Steers Offered Grass Silage and Concentrates Based on Contrasting Cereal Grain Types Supplemented with Field Beans, Peas or Maize By-Products
Intake, Growth and Carcass Traits of Steers Offered Grass Silage and Concentrates Based on Contrasting Cereal Grain Types Supplemented with Field Beans, Peas or Maize By-Products Open
The study objective was to determine intake and performance of beef cattle individually offered perennial ryegrass-dominant grass silage ad libitum supplemented with 4 kg dry matter daily of, rolled barley or maize meal-based concentrate r…
View article: Genome Sequence of an Ungulate Tetraparvovirus 1 from a Nasal Swab of an Irish Beef-Suckler Calf
Genome Sequence of an Ungulate Tetraparvovirus 1 from a Nasal Swab of an Irish Beef-Suckler Calf Open
Here, we report the genome sequence of strain UTPV1/AB belonging to the species Ungulate tetraparvovirus 1 (UTPV1). UTPV1/AB was isolated in the east of Ireland, directly from a nasal swab of a beef-suckler calf diagnosed with bovine respi…
View article: Genome Sequence of Bovine Coronavirus Variants from the Nasal Virome of Irish Beef Suckler and Pre-weaned Dairy Calves Clinically Diagnosed with Bovine Respiratory Disease
Genome Sequence of Bovine Coronavirus Variants from the Nasal Virome of Irish Beef Suckler and Pre-weaned Dairy Calves Clinically Diagnosed with Bovine Respiratory Disease Open
We report 24 bovine coronavirus (BCoV) genome sequences from Ireland. BCoV was sequenced directly from nasal swabs that had been collected during a bovine respiratory disease (BRD) outbreak among recently purchased beef suckler and pre-wea…
View article: Animal welfare index: an animal welfare evaluation of beef production farms in Ireland
Animal welfare index: an animal welfare evaluation of beef production farms in Ireland Open
The study objective was to examine the animal welfare status of Irish beef production farms using an animal welfare index (AWI). Beef production farms (n = 105) including suckler calf-to-beef (n = 30), suckler calf/weaning/finishing (n = 6…
View article: The Colour, Composition and Eating Quality of Beef from Late- or Early-Maturing Suckler Bulls Finished at Pasture with or without Concentrate Supplementation
The Colour, Composition and Eating Quality of Beef from Late- or Early-Maturing Suckler Bulls Finished at Pasture with or without Concentrate Supplementation Open
Carcasses from pasture-finished early-maturing (EM), rather than late-maturing (LM), breed bulls may be more suited to meet the minimum carcass fatness classification of 2+ (6.0 on a 15-point scale) required for some markets. The comparati…
View article: Does Finishing at Pasture Influence the Colour of Muscle from Suckler Bulls and Can Colour Be Used to Authenticate Their Pre-Slaughter Diet?
Does Finishing at Pasture Influence the Colour of Muscle from Suckler Bulls and Can Colour Be Used to Authenticate Their Pre-Slaughter Diet? Open
The primary objective of this study was to compare the colour of muscle from bulls finished at pasture or indoors on a high concentrate diet. The ancillary objectives were to identify possible explanations for any differences in the colour…
View article: Full adoption of the most effective strategies to mitigate methane emissions by ruminants can help meet the 1.5 °C target by 2030 but not 2050
Full adoption of the most effective strategies to mitigate methane emissions by ruminants can help meet the 1.5 °C target by 2030 but not 2050 Open
Significance Agricultural methane emissions must be decreased by 11 to 30% of the 2010 level by 2030 and by 24 to 47% by 2050 to meet the 1.5 °C target. We identified three strategies to decrease product-based methane emissions while incre…
View article: Effect of pre-grazing herbage mass on pasture production and performance of suckler-bred steers during the grazing season and subsequent indoor finishing period
Effect of pre-grazing herbage mass on pasture production and performance of suckler-bred steers during the grazing season and subsequent indoor finishing period Open
The objective was to determine the effect of pre-grazing herbage mass (PGHM) on herbage production and nutritive value, intake and growth of suckler-bred steers in a rotational stocking system, and the residual effects on intake, growth an…
View article: PSIV-8 Effect of pre-grazing herbage mass, post-grazing sward height and finishing diet on performance of late-maturing beef steers
PSIV-8 Effect of pre-grazing herbage mass, post-grazing sward height and finishing diet on performance of late-maturing beef steers Open
Grazing sward structure can influence animal performance in forage-only and forage plus concentrate-based production systems. The objective was to determine the effects of pre-grazing herbage mass (PGHM), post-grazing sward height (PGSH) a…
View article: Effect of Post-Grazing Sward Height, Sire Genotype and Indoor Finishing Diet on Steer Intake, Growth and Production in Grass-Based Suckler Weanling-to-Beef Systems
Effect of Post-Grazing Sward Height, Sire Genotype and Indoor Finishing Diet on Steer Intake, Growth and Production in Grass-Based Suckler Weanling-to-Beef Systems Open
This study evaluated the effects of post-grazing sward height (PGSH, 4 or 6 cm) on herbage production, its nutritive value, dry matter (DM) intake, grazing behaviour and growth of early- (EM) and late-maturing (LM) breed suckler steers (n …
View article: Horn bud size of dairy-bred and suckler-bred calves at time of disbudding
Horn bud size of dairy-bred and suckler-bred calves at time of disbudding Open
Background Hot-iron disbudding is a common management procedure to prevent horn growth in calves. The study objective was to examine effect of age, breed and sex on horn bud size of dairy-bred and suckler-bred calves at time of disbudding.…
View article: Strategies to mitigate enteric methane emissions by ruminants - a way to approach the 2.0°C target.
Strategies to mitigate enteric methane emissions by ruminants - a way to approach the 2.0°C target. Open
Ruminant livestock enteric fermentation contributes approximately one-third of the global anthropogenic methane (CH 4 ) emissions and is projected to increase significantly to meet the increasing demand for animal-sourced protein. Methane,…
View article: Concentrate supplementation with dried corn gluten feed improves the fatty acid profile of <i>longissimus thoracis</i> muscle from steers offered grass silage
Concentrate supplementation with dried corn gluten feed improves the fatty acid profile of <i>longissimus thoracis</i> muscle from steers offered grass silage Open
BACKGROUND Concentrate supplementation of a grass silage‐based ration is a typical practice employed for indoor winter finishing of beef cattle in many temperate countries. Plant by‐products, such as dried corn gluten feed (CGF), can be us…
View article: Effect of age of suckler beef calves on stress indicators and growth performance in response to Burdizzo castration
Effect of age of suckler beef calves on stress indicators and growth performance in response to Burdizzo castration Open
The study objective was to examine effect of age at castration on stress indicators and performance of 40 crossbred suckler beef calves. Calves were assigned to two age groups and two castration treatments; calves 2.5- or 5.0-mo-old (mean …
View article: Fatty acid composition, shelf-life and eating quality of beef from steers fed corn or wheat dried distillers' grains with solubles in a concentrate supplement to grass silage
Fatty acid composition, shelf-life and eating quality of beef from steers fed corn or wheat dried distillers' grains with solubles in a concentrate supplement to grass silage Open
Thirty-six steers were randomly assigned to one of three dietary treatments fed ad libitum grass silage and concentrate supplements containing either barley/soybean meal (CON), 80% DM corn (CDGS)- or 80% DM wheat (WDGS)-dried distillers' g…
View article: Growth performance and hematological changes of weaned beef calves diagnosed with respiratory disease using respiratory scoring and thoracic ultrasonography
Growth performance and hematological changes of weaned beef calves diagnosed with respiratory disease using respiratory scoring and thoracic ultrasonography Open
This study investigated 1) the effect of clinical bovine respiratory disease (BRD) and associated lung consolidations on growth performance and hematological profiles of recently weaned beef calves and 2) the relationship between clinical …
View article: Effect of calfhood nutrition on metabolic hormones, gonadotropins, and estradiol concentrations and on reproductive organ development in beef heifer calves
Effect of calfhood nutrition on metabolic hormones, gonadotropins, and estradiol concentrations and on reproductive organ development in beef heifer calves Open
This study examined the effect of plane of nutrition on the endocrinological regulation of the hypothalamic–pituitary–ovarian (HPO) axis in beef heifer calves during a critical sexual developmental window early in calf hood. Forty Holstein…