Animal and Dairy Science Resources
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In recent years, global climate change has been one of the most frequently discussed scientific ideas in the popular press. Terms like “global warming” and “greenhouse gas” have been politicized with little discussion of what they really mean, shedding more heat than light on scientific discussions of changing climate. Concerns about the relative contributions of greenhouse gases from different industries have caused much finger pointing without making it clear how the gases are produced and what options are available for management of the gas emissions. In particular, agriculture has been identified as one of the major contributors to greenhouse gas emissions, and this has caused consumers to question the production practices used in modern agricultural systems. Specific focus has been placed on cattle production because these animals digest feed by a process called “enteric fermentation,” which produces methane as a by-product. The purpose of this bulletin is to explain the basic debate surrounding methane production from livestock, in particular how it is produced in the rumen.
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Cattle producers commonly evaluate reproductive performance by determining how many cows became pregnant during the breeding season. Although pregnancy rates are important, when the females become pregnant within the breeding season is a major component of cow-calf profitability. Cows that become pregnant early in the breeding season calve earlier in the calving season. Consequently, they have more time to recover before the next breeding season, which increases their chances of becoming pregnant and staying longer in the herd. Estrus synchronization programs have the ability of inducing estrus and can be combined with natural service to increase the percentage of cows and heifers that become pregnant early in the season. This publication describe different synchronization protocols that can be incorporated by cow-calf producers utilizing only natural service.
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Genomic testing is not a new idea in the eyes of science, but its application in today’s beef industry is still met with some confusion. The purpose of this publication is to explain to county agents and producers how genomic testing works, how to use the results, and why this technology is valuable to cattlemen. This bulletin covers a simple history of genetic technology; parentage testing and simple inheritance; how genomic tests work, including sample collection and how results are used; and accuracy and GE-EPDs.
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Sprouted grains are usually considered unsuitable for milling or distilling; however, they can serve as an excellent source of nutrients for cattle.
Wheat, which is commonly used for human consumption, is usually priced higher than other feedstuffs and is typically not utilized for livestock consumption. Sprouted wheat, however, is discounted heavily at the mill and may be economically feasible to incorporate into beef cattle rations.|
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This publication primarily focuses on rear discharge, twin spinner spreaders common for poultry litter application in the southeast.
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The pre-breeding period (2 months prior to breeding) is essential for preparing bulls for a successful breeding season. This is particularly important for yearling bulls as they are still growing and will use for energy during their first breeding season. Pre-breeding management should include an adaptation period, breeding soundness exam, health care, exercise, and an evaluation of body condition score. These topics are discussed in the circular. Proper pre-breeding management will increase reproductive efficiency and profitability in beef herds.
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In the Southeastern U.S., beef cattle producers focus on forage management and maximizing the grazing season. To that end, Southeastern cattle spend the vast majority of their lives either grazing or consuming stored forage. Cereal grains and coproduct feeds are also commonly used nutritional supplements for cattle in times of elevated nutrient requirement. Any disease or disorder in the beef herd represents a nutrient drain and subsequent economic inefficiency. Sudden shifts in dietary composition as well as mineral imbalances are the primary causes for most nutritional and metabolic disorders. This publication contains an overview of the common nutritional and metabolic disorders that may affect beef herds in the Southeast along with management strategies that can be used to minimize the effects of these disorders in beef cattle production systems.
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Due to cows’ universal exposure to manure, which contains E. coli and other gram-negative bacteria, as well as the requirement to maintain sec as low as possible, all cows should be vaccinated with one of the coliform vaccines available on the market. These vaccines have been proven to significantly reduce clinical coliform mastitis and have been shown to be profitable when incidence of clinical coliform mastitis exceeds 1% of milking cows.
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Body condition scoring (BCS) is an easy and economical way to evaluate the body fat percentage of a cow. Cows can then be sorted and fed according to nutritional needs. Body condition scoring can be an effective tool for cattle producers who cannot weigh cattle, and it may be an even better measurement of cow condition and reproductive performance than weight. Most studies show that body condition decreases at a faster rate than weight loss. Therefore, body condition scoring can estimate the probability of re-breeding.
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