What livestock research is finding right now — genetics, reproduction, nutrition, health, climate and data — summarised in plain language from peer-reviewed journals and university sources. Every entry links to the original. We add new items as they are published.
An editorial summarising a research collection notes that the field now works with whole-genome sequence, transcriptomes and epigenomes rather than low-density marker panels. Among the studies: partitioning genetic variance for carcass and meat traits in Angus, and genome-wide scans for backfat and feed conversion in Landrace pigs.
Original studyA new collection on livestock genetics and health reports heritabilities from 0.03 to 0.44 for antibody responses to common infections in Tanzanian dairy cattle, and shows genomic selection can raise resistance to a lethal virus in rainbow trout. Health traits, the editors conclude, are selectable.
Original studyA review of genomic work published 2010–2026 traces cattle from the first domestication in the Fertile Crescent and Indus Valley to modern Holstein and Simmental, arguing that introgression from extinct relatives and continuous adaptation left a genomic map that breeders can now read directly.
Original studyAs dairy herds breed more cows to beef sires, evaluating the resulting calves has become a genetic-evaluation problem in its own right. The Beef Improvement Federation describes a growth-based metric intended to make beef-on-dairy sire comparisons more consistent.
Original coverageWhere gilt selection is still mostly visual, a case study estimated genetic parameters for daily gain, backfat and loin depth from mandatory on-farm performance tests and found enough heritability to expect 2–3% annual genetic progress if the data were actually used for selection.
Original studyA survival analysis of PIC parent sows on 329 farms worldwide shows litter size rising by 0.16 piglets a year since 2000 while sow survival fell steadily over the same period. The authors see tentative signs of a turnaround from 2022 and put economic values on longevity.
Original studyAn observational study on commercial farms set out to identify factors linked to gilt longevity and to build a multi-criteria model that classifies incoming gilts by their maternal success and survival potential, using measures a farm can take itself.
Original studyFollowing 414 gilts arriving at a multiplication farm at 8–10 weeks of age, researchers compared animal-based measures — including skin and ear wounds — between those later selected for breeding and those diverted to market, to find early markers of exclusion.
Original studyMeasuring reproductive tracts from first oestrus and tracing litter of origin, a study links prenatal conditions to lifetime reproductive performance of replacement gilts — evidence that the litter a gilt came from carries information worth using at selection.
Original studyPurdue researchers are examining why a large share of cattle pregnancies fail early, work that could change how heifers are managed around breeding and how reproductive traits are evaluated.
Original coverageFeeding gilts a lower-nutrient diet before first breeding, rather than the customary heavy feeding, produced sows that lost less weight in lactation and, across four cycles, farrowed 30 more litters and weaned about 200 more pigs than controls. Roughly half of US sows are replaced after one lactation, the researchers note.
Original sourceA review of the Danish approach to rearing replacement gilts, presented at ASAS Midwest 2026, draws on records of more than half a million gilts served in 2021–2025. Females first served at 211–230 days of age or earlier survived longer in the herd than those served later, with the risk of removal rising step by step for each older age band. The recommended answer is a three-phase rearing diet that holds growth to a plateau, so that gilts reach second heat at 30–33 weeks within a tight weight and backfat range.
AbstractA study on short-term feed increases for previously restricted gilts opens with a sober summary of the replacement problem in American herds: annual culling and mortality together approach 60 % of the sow inventory, sows are often removed at parity 3–4 before repaying their rearing cost, and between 13 and 40 % of gilts are removed before their first litter, mostly for lameness or reproductive failure. The authors test whether a nutritional “flush” before breeding can recover ovulation rates in gilts reared on restricted feed.
Original studyResearchers followed 42 Holstein heifers reared on an intensive milk programme and split them by average daily gain before weaning. The faster-growing cluster reached the 400 kg breeding threshold 42 days earlier and calved 38 kg heavier, while age at first calving did not differ. The study adds cattle evidence to a pattern seen in pigs: growth in the first weeks of life carries information about the animal’s later trajectory.
Original studyAs litters grow, lactating sows often cannot eat enough to cover milk output. A team proposes feed-efficiency classes for gilts and sows based on measured milk production and changes in body composition through lactation — a step toward selecting for efficient mothers, not only prolific ones.
Original studyA University of Tennessee project is testing how the microbial community in the rumen influences how efficiently cattle convert feed into gain, with the aim of finding microbial signatures that could be selected or managed for.
Original coverageNursery pigs bred from parents with divergent genomic breeding values for feed conversion were compared for growth and faecal microbiome. The work asks whether efficiency selected on the genome shows up in the gut community of the next generation.
Original studyA field study combining management review, feeding changes and necropsies found the main causes of sow death were organ displacement, arthritis and urogenital disorders. Targeted measures on housing, body condition and genetics brought mortality down within a year.
Original studyA review of commercial gilt-selection standards shows that animals chosen on structure alone at 20–22 weeks often fail later, and that sensors, analytics and early-life biomarkers are expected to raise accuracy. The authors call for research that links selection decisions to welfare outcomes.
Original studyThe 2026 revision of the standard veterinary reference lists the criteria for an individual gilt: litter size and birth weight of her dam line, weaning weight, growth rate to 160 days, lifetime health status, age at puberty and days to oestrus after boar exposure.
Original sourceHolstein × Jersey calves on tropical pasture received a multi-component additive from birth to 90 days. By 180 days, methane per kilogram of body weight was actually higher in the supplemented group — a reminder that early-life programming of the rumen does not automatically reduce emissions.
Original studyA systematic review and meta-analysis pools trial data on additives used to cut enteric methane in dairy cattle, rating the risk of bias in each study and estimating which classes of additive show consistent reductions and which do not.
Original studyMeasuring emissions across growing heifers, lactating and dry Holstein cows, a review finds that physiological stage and the fibre-to-starch ratio of the diet drive methane output — so herd structure, not only feed additives, is a lever for mitigation.
Original studyA scientometric analysis of publications and patents on precision livestock farming and welfare finds research concentrated on dairy cattle, with validated tools for pigs, poultry, sheep and goats still scarce. The authors argue that economics and adoption, not more algorithms, now limit impact.
Original studyUCLA's NIH-supported summer institute brings statistical genetics, machine learning and biobank-scale analysis together in one programme. The methods discussed there — heritability estimation, polygenic prediction, association mapping — are the same toolkit livestock geneticists now use.
Original sourceA team working under real production conditions in Peru’s San Martín region collected 3,800 lateral photographs of pigs, each paired with a scale reading, and built a pipeline of geometric standardisation, YOLOv8 segmentation and EfficientNet features feeding a regression model. The aim is a low-cost, non-invasive weighing tool for a region where pig production is growing quickly and scales are not always at hand.
Original studyUsing ordinary RGB images of group-housed pigs and a YOLOv11 segmentation model, the authors extracted the dorsal area of each numbered animal and fed it to linear and neural-network regressions. For most animals the fit was tight, with R² up to 0.98 and errors below 1.1 kg; variability rose where body shape was less typical. The study is one of the few to target the growing stage rather than finishing pigs.
Original studyMost vision systems treat weight as a black-box regression from an image. This paper instead makes the model estimate body length and body width explicitly from a single top-view depth image and derive weight from those, mirroring the tape-measure logic used on farms. The authors report better robustness in commercial pens, where posture and crowding usually defeat direct regression.
Original studyBecause few sensors are validated for sheep, researchers tested a cattle behaviour collar on twenty ewes, indoors and on pasture, against 24-hour video. The collar tracked eating and rumination well enough to be useful — one of the first such validations for sheep.
Original studyA review from Kenya's national sheep and goat breeding station maps which precision-livestock and AI tools have actually reached goat farms and which remain at the research stage, and lists the infrastructure and cost barriers that keep them out of smallholder systems.
Original studyA review of AI-assisted selection in sheep proposes linking reproductive traits to behavioural indicators captured non-invasively by video and wearable sensors, drawing on more than 300 studies of deep learning in precision sheep farming published since 2003.
Original study
The Institute of Climate-Oriented Agriculture of Ukraine's National Academy of Agrarian Sciences held its international conference “Economic and digital levers of agribusiness adaptation to climate change” online on 15 September. The plenary brought together a professor from Warsaw (Poland), representatives of FAO, Brazil and the United States (Los Angeles), Ukraine's Ministry of Economy, the agricultural departments of the Kherson and Odesa regional administrations, the National Academy of Agrarian Sciences, the host institute's acting director and the National Scientific Centre “Institute of Agrarian Economics”, with M. M. Stepanova moderating.
Most talks dealt with farm economics, irrigation and digital services for growers. The one animal-science contribution stood out for its novelty: Dr. Artur Ishkhanyan (Los Angeles, USA), speaking between the Warsaw professor and the Institute of Agrarian Economics, presented “Early evaluation of pig productivity by intensity of body formation: from a doctoral study to a practical tool” — a method that reads a young animal's future reproductive and fattening performance from ordinary weighings in the first months of life, validated in a multi-year controlled experiment and now being turned into a farm-level software tool. For a programme centred on economic resilience, an approach that cuts the cost of raising replacement stock that will later be culled was a rare concrete lever.
Plenary session of the ICSA NAAS conference, 15 September 2026 (screenshot).
Conference organiserThe Kovalenko department of animal breeding at Kherson State Agrarian and Economic University will host a national scientific and practical conference on the state and prospects of Ukrainian livestock production under European integration. Tracks cover breeding and genetics, technology, feeding, veterinary issues, welfare and commercialisation. Participation and publication are free; abstracts are due 9 October.
Host universityAbstracts from the 2026 Midwest Section meeting, published in the Journal of Animal Science supplement, show swine research converging on two questions: which gilts will stay in the herd, and how efficiently modern sows turn feed into milk. Several entries in this digest come from that programme.
Abstract supplementAbout this digest. Entries are written in our own words from the cited sources; no text or images are reproduced from the originals, and the illustrations are our own. Inclusion is not endorsement, and summaries cannot replace reading the study. If we have misread a result, write to support@herdgenanalytics.com and we will correct it.
