Geoffry Fordyce
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View article: Characterisation of reproductive tract microbiome and immune biomarkers for bovine genital campylobacteriosis in vaccinated and unvaccinated heifers
Characterisation of reproductive tract microbiome and immune biomarkers for bovine genital campylobacteriosis in vaccinated and unvaccinated heifers Open
Background Bovine genital campylobacteriosis (BGC) is a globally important venereal disease of cattle caused by Campylobacter fetus subspecies venerealis . Diagnosis of BGC is highly challenging due to the lack of accurate diagnostic tests…
View article: Multi-breed genomic evaluation for tropical beef cattle when no pedigree information is available
Multi-breed genomic evaluation for tropical beef cattle when no pedigree information is available Open
Background It has been challenging to implement genomic selection in multi-breed tropical beef cattle populations. If commercial (often crossbred) animals could be used in the reference population for these genomic evaluations, this could …
View article: Concurrently mapping quantitative trait loci associations from multiple subspecies within hybrid populations
Concurrently mapping quantitative trait loci associations from multiple subspecies within hybrid populations Open
Many of the world’s agriculturally important plant and animal populations consist of hybrids of subspecies. Cattle in tropical and sub-tropical regions for example, originate from two subspecies, Bos taurus indicus ( Bos indicus ) and Bos …
View article: Integrating genome-wide association and expression quantitative trait loci (eQTL) analyses identifies genes affecting fertility in cattle and suggests a common set of genes regulating fertility in mammals
Integrating genome-wide association and expression quantitative trait loci (eQTL) analyses identifies genes affecting fertility in cattle and suggests a common set of genes regulating fertility in mammals Open
Most genetic variants associated with fertility in mammals fall in non-coding regions of the genome and it is unclear how these variants affect fertility. Here we used genome-wide association (GWAS) summary statistics for heifer puberty (p…
View article: Reproductive performance of northern Australian beef herds. 3. Descriptive analysis of major factors affecting reproductive performance
Reproductive performance of northern Australian beef herds. 3. Descriptive analysis of major factors affecting reproductive performance Open
Context The performance of commercial beef-breeding herds in northern Australia is highly variable. Identifying and understanding the major factors that influence this is critical in determining which management interventions should be imp…
View article: Table of Contents
Table of Contents Open
The Rangeland Journal publishes papers of scientific merit for a readership of scientists, educators, managers and users. Contributions may be on any aspect of the ecology, use, management or conservation of rangelands, either within Austr…
View article: Concurrently mapping quantitative trait loci associations from multiple subspecies within hybrid populations
Concurrently mapping quantitative trait loci associations from multiple subspecies within hybrid populations Open
Many of the world’s agriculturally important plant and animal populations consist of hybrids of subspecies. Cattle in tropical and sub-tropical regions for example, originate from two genetically distinct subspecies, Bos indicus and Bos ta…
View article: High frequency of delayed milk delivery to neonates in tropical beef herds
High frequency of delayed milk delivery to neonates in tropical beef herds Open
Beef‐calf mortality rates across tropical and subtropical Australia are high, with sub‐optimal nutrition in pregnant cows being the primary risk. The nutritional deficiencies associated with calf mortality are the same as those associated …
View article: Environmental variation effects fertility in tropical beef cattle
Environmental variation effects fertility in tropical beef cattle Open
The northern Australia beef cattle industry operates in harsh environmental conditions which consistently suppress female fertility. To better understand the environmental effect on cattle raised extensively in northern Australia, new envi…
View article: Production and performance of commercial beef breeding females in northern Australia. 4. Factors influencing the occurrence of lactating cows becoming pregnant within 4 months of calving
Production and performance of commercial beef breeding females in northern Australia. 4. Factors influencing the occurrence of lactating cows becoming pregnant within 4 months of calving Open
Context Sound reproductive efficiency is a key determinant for the overall productivity of a beef breeding business. For beef breeding herds to obtain high levels of reproductive productivity, breeding females need to efficiently become pr…
View article: Reproductive performance of northern Australia beef herds. 5. Factors influencing risk of non-pregnancy
Reproductive performance of northern Australia beef herds. 5. Factors influencing risk of non-pregnancy Open
Context Sound reproductive efficiency is a key determinant for the overall productivity and profitability of a beef breeding business. Failure of a cow to conceive results in either culling or the cost of carrying non-pregnant animals. Aim…
View article: Immediate prepartum supplementation accelerates progesterone decline, boosting passive immunity transfer in tropically adapted beef cattle
Immediate prepartum supplementation accelerates progesterone decline, boosting passive immunity transfer in tropically adapted beef cattle Open
Context Poor nutrition of late-pregnant cows is highly prevalent in the dry tropics and associated with high levels of calf mortality. Aims It was hypothesised that supplementation with protein to prepartum cows would restore the normal de…
View article: Prevalence of <i>Tritrichomonas foetus</i> in beef bulls slaughtered at two abattoirs in northern Australia
Prevalence of <i>Tritrichomonas foetus</i> in beef bulls slaughtered at two abattoirs in northern Australia Open
Bovine trichomoniasis, caused by the protozoal parasite Tritrichomonas foetus , is a highly contagious venereal disease characterised by early pregnancy loss, abortion and pyometra. Persistently infected bulls and cows are the primary rese…
View article: Australian cattle herd: a new perspective on structure, performance and production
Australian cattle herd: a new perspective on structure, performance and production Open
Context Businesses within the Australian cattle industries and associated research and advisory agencies require accurate data on production and performance of the national herd. Currently, these are derived from survey and statistical dat…
View article: Use of whole-genome sequence data and novel genomic selection strategies to improve selection for age at puberty in tropically-adapted beef heifers
Use of whole-genome sequence data and novel genomic selection strategies to improve selection for age at puberty in tropically-adapted beef heifers Open
Background In tropically-adapted beef heifers, application of genomic prediction for age at puberty has been limited due to low prediction accuracies. Our aim was to investigate novel methods of pre-selecting whole-genome sequence (WGS) va…
View article: Delay in Progesterone Decline Before Parturition is Connected with Failure of Passive Immune Transfer in Tropical Composite Beef Calves
Delay in Progesterone Decline Before Parturition is Connected with Failure of Passive Immune Transfer in Tropical Composite Beef Calves Open
A shortage of nutrients during the final period of gestation can decrease secretion of colostrum, which is critical to newborn calf survival. The physiological mechanism modulating the nutritional control of colostrum secretion is poorly u…
View article: Milk Delivery in Tropically-Adapted Neonatal Beef Calves
Milk Delivery in Tropically-Adapted Neonatal Beef Calves Open
Across beef breeding herds of northern Australia, poor pre-partum nutrition of cows is consistently associated with increased calf wastage between confirmed pregnancy and weaning. With key nutrients at play (especially energy, protein, ph…
View article: Pregnancy Nutrition Affects Calf Survival in the Tropics
Pregnancy Nutrition Affects Calf Survival in the Tropics Open
The net cost of calf loss between confirmed pregnancy and weaning in a north Australian beef business is >$400. [...]
View article: Prepartum Supplementation to Improve Transfer of Passive Immunity and Growth
Prepartum Supplementation to Improve Transfer of Passive Immunity and Growth Open
Late pregnant cows often experience nutritional stress in northern Australia, which reduces colostrum secretion, health, and likelihood of survival of neonatal calves. The effect of prepartum supplementation on the transfer of passive immu…
View article: Finding the ‘Sweet Spot’ for reproductive performance in north Australian beef herds
Finding the ‘Sweet Spot’ for reproductive performance in north Australian beef herds Open
We know that nutrition has a dominating effect on the reproductive performance of beef breeding
\nfemales, but the level of pasture utilisation required for optimal cow herd production in northern Australia is unknown. We are using existin…
View article: Multivariate genomic predictions for age at puberty in tropically adapted beef heifers1
Multivariate genomic predictions for age at puberty in tropically adapted beef heifers1 Open
Heifers that have an earlier age at puberty often have greater lifetime productivity. Age at puberty is moderately heritable so selection should effectively reduce the number of days to puberty, and improve heifer productivity and profitab…
View article: Towards multi-breed genomic evaluations for female fertility of tropical beef cattle1
Towards multi-breed genomic evaluations for female fertility of tropical beef cattle1 Open
Developing accurate genomic evaluations of fertility for tropical beef cattle must deal with at least two major challenges (i) recording cow fertility traits in extensive production systems on large numbers of cows and (ii) the genomic eva…
View article: Ultrasonographic measurements in first trimester concepti identify predictors of birth weight and postnatal development in cattle1
Ultrasonographic measurements in first trimester concepti identify predictors of birth weight and postnatal development in cattle1 Open
The placenta is a major driver of prenatal growth and involved in programming of postnatal performance. We therefore determined placental and embryo-fetal ultrasonographic parameters in early pregnancy and their relationships with birth we…