The Mashona cattle, a Bos taurus and Bos indicus composite, were brought from Zimbabwe to New Mexico in the 1990s. Since then, they have been valued by ranchers in hot and humid areas for their resistance to pests, heat, and maternal characteristics, making them ideal for crossbreeding. This study aimed to explore the genetic background and diversity of Mashona cattle in the United States by analyzing 24 samples from Tennessee State University.

Heterosis, or hybrid vigor, is traditionally defined as the increase in the performance of crossbred progeny relative to the average performance of their purebred parents. These heterosis effects may vary depending on the breed of animals in the original cross; however, breed-specific estimates are difficult to obtain because of the resources required to estimate the effects. The Germplasm Evaluation Program at the U.S. Meat Animal Research Center is designed to evaluate crosses of 18 different prominent U.S. beef cattle breeds.

The Dublin Declaration of Scientists on the Societal Role of Livestock (2023) was initiated during the International Summit on the Societal Role of Meat, held in October 2022 in Dublin. Scientific evidence in support of the declaration was provided through a variety of oral presentations by leading experts and a series of articles published in a previous Themed Issue of Animal Frontiers (Volume 13, Issue 2, April 2023, ISSN 2160-6056, EISSN 2160-6064). Since the declaration was issued for the publishing of this editorial, over 1,200 verified scientists from around the world have signed to document their agreement.

Ruminants present variability in enteric methane (CH4) emissions over time and due to changes in dietary characteristics; however, limited information exists regarding the re-ranking according to CH4 emissions of growing steers during the backgrounding and finishing phases, and the effect of using metabolic modulators such as growth-promoting implants, on gas flux. In this experiment, 46 Angus steers were evaluated during the backgrounding and finishing phases.

Globally there is a requirement to reduce greenhouse gas emissions while increasing food production to meet the nutritional demands of the growing population. In this study, linseed oil, a temperate brown seaweed, or an extract of the brown seaweed were mixed into concentrate feed and offered to growing beef bulls every morning and evening.

High dietary levels of zinc oxide (ZnO) have been used in swine production to prevent/control postweaning diarrhea. However, such strategy has been demonstrated to stimulate bacterial resistance to antibiotics and metals.

Luteolin (Lut) is a natural flavonoid extract from various plants and exhibits multiple biological activities, including anti-inflammatory, antitumor, antibacterial, and antiviral effects. Importantly, Lut can form metal complexes with trace metal elements, enhancing its resorption and utilization in animals.

High-starch diets in rabbit farming may pose health risks. Therefore, we focused on fats, another key energy source for monogastric animals, and investigated the effects of replacing part of the dietary starch with fats of equivalent digestible energy.

Pellet quality is an important determinant of downstream animal performance, as well as efficiency of production both at the mill and farm. Pellet Durability Index (PDI) is a metric used in commercial feed milling to signal the pellet quality of pelleted feeds, and what degradation of pellets might occur during subsequent handling and transportation.

With a March 14th deadline looming, Congress was able to pass a continuing resolution to fund the government through the remainder of fiscal year 2025. The resolution included mainly “level” funding for programs at their fiscal year 2024 amounts. That was true for USDA’s agricultural research accounts within NIFA, ARS, ERS and NASS. The one exception was the removal of funding in the ARS Buildings and Facilities line for fiscal year 2025.

Estimated breeding values provide an estimate of the genetic merit of an individual for specific traits helping to identify animals with superior genetic potential for growth rate, milk production, meat quality, disease resistance, and more. Over recent years, American Angus Association members have visually scored cows for teat size (TS) and udder suspension score (US), amassing approximately 42,000 records on approximately 24,000 cows.

Condemned livers result in over $15M in lost income to the U.S. beef industry annually and the main cause of condemned livers is from abscesses. Liver scoring is a four-level measurement of abscess severity: 0 (no abscesses), A− (mild abscesses), A (moderate abscesses), and A+ (severe abscesses).

If methods existed to identify gilts that will become lame in breeding herds, then these gilts could be redirected as market animals indirectly improving sow well-being, longevity, and increasing profitability. This study evaluated gilts (age 5 mo) and then observed those retained for breeding throughout their productive life.

Negative social behaviors between pigs can cause stress, which can compromise welfare. There has been significant interest in exploring the effect of diet on negative social behaviors and the wider social behavior repertoire of pigs. The aim of this study was to determine the effects of dietary lysine and tryptophan levels, 2 amino acids found in pig feed, on the social behavior of commercially housed pigs.

As a fermentable milk drink, kefir may affect gastrointestinal microbiota, but such products are poorly studied in companion animals. Our objective was to determine how commercial or traditional kefir feeding impacted the in vitro fermentation characteristics of fibers common in pet foods.

The March Edition of The Giving Herd, an ASAS Foundation Newsletter

A group of Editors-in-Chief from leading animal science journals has published a collective perspective on today’s rapidly shifting world of scholarly publishing. Titled “Values Shared by Journals of Learned Societies, Associations, and Scientific Institutions in Animal Science” this jointly authored editorial underscores how society-owned journals preserve scientific integrity, maintain rigorous peer review, and ensure responsible access to research findings—even in an increasingly author-driven environment.

This study examined how breed and trace mineral sources affect growth and diarrhea incidence during periods of nutrient restriction and grazing. Breeds consisted of ½ Angus × ½ Nelore (ANE) and Nelore (NE) heifers, whereas mineral sources included sulfate (SUL) or hydroxychloride (HYD) sources of copper, manganese, and zinc offered to heifers from days 0 to 49.

Feeding pigs diets with lipids that contain peroxides and aldehydes has been reported to reduce pig performance. Four experiments conducted in growing pigs fed diets containing variable levels of peroxides and aldehydes confirmed that lipid oxidation products have a detrimental effect on pig performance and show that the reduction in daily gain, feed intake, and feed efficiency can be accurately predicted by analyzing dietary concentrations of peroxides and aldehydes.

Swine are exposed to a variety of nutritional stressors that can affect their well-being and productivity. One stressor of concern is the consumption of lipids that have been damaged by excessive heating. The current study obtained blood from pigs consuming peroxidized soybean oil and subsequently evaluated for markers of oxidative stress, including plasma vitamin E.