Estrus detection by cow vocalization

Alvaro Garcia

In the relatively recent past different devices were developed to monitor estrus. Examples are those that record increased cow activity alone (pedometers), or a combination of the latter with a reduction in intake and rumen motility. Other devices attached to the cows’ back focus on standing mounting behavior by the animals in heat. More recently, there have been devices that have focus on cow vocalization.

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Feeding behavior and agonistic interactions at the feed bunk affect ketosis in dairy cows

Alvaro Garcia

The transition period is challenging for lactating dairy cows. Many ailments pop-up of metabolic as well as infectious origin result of increased stress/reduced defenses, and sudden increased body demands for nutrients. One frequent problem in high producing, over conditioned cows is ketosis. According to US dairy producers, ketosis is the top metabolic problem in dairy cows (APHIS, 2014).

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Cows in a milking room

Vitamin D effects on mammary gland immunity in dairy cows

Alvaro Garcia

Reducing the use of antimicrobial drugs is a concern in modern animal production. As a result, successful health interventions through the use of natural feed additives are currently explored. Vitamin dietary fortification has shown promise as potential to improve health and prevent disease. Vitamin D, for example, has shown effects from this perspective against both mastitis and metritis.

Aside from role of vitamin D in Ca and P homeostasis there are other effects however, such as its immunomodulatory role in cattle innate immune cells and mammary gland. This vitamin intervenes in physiological functions regulated by enzymatic activation and intracellular vitamin D receptors. The form supplemented however is important. Cows fed 25(OH)D3 have shown improved neutrophil function, mastitis reduction, reduced risk of retained placenta, metritis, and increased milk yield compared with cows fed just vitamin D3.

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Could bedding material be a source of gastrointestinal parasites in dairy farms?

Lucas Pantaleon

Recycled manure solids (RMS) are used as bedding material in dairies due to its onsite availability and increased cow comfort. The methods to producing RMS are wide-ranging and the potential for the material to be a source of parasites has not been well researched.

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Risk factors associated with mastitis in automatic milking dairy herds

Lucas Pantaleon

The installation of automatic milking systems (AMS) is becoming more common around the world, as well as larger herd sizes. Risk factors for mastitis in farms using AMS may be different from farms using conventional milking systems (CMS). The reason behind this difference is the different management practices between CMS and AMS. On AMS farms mastitis detection is based on screening with sensors, whilst at CMS detection is done cow side during milking. Another dissimilarity is that udder preparation in AMS farm is done automatically, that is the process is always carried out with the same intensity.

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Can we improve corn silage quality by applying foliar fungicide?

Francisco E. Contreras Govea, Ph.D

Corn for silage is one of the most important crops to feed the dairy and beef cattle. In the United States, on average, 2.492 millions of ha are harvested and ensiled (Ferraretto et al., 2018). Some of the advantage of corn over other forages are lower harvesting cost, high yield per area, and the possibility of harvesting either for grain or silage depending on the market price. In addition, corn for silage has high energy value and provides effective fiber to maintain rumen health. Therefore, any new technology or alternatives to improve the nutritive value of corn for silage is worth it.

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Associations of postpartum health disorders with reproductive performance in dairy cows

Alvaro Garcia

According to past research up to 70% of lactating dairy cows develop metabolic and/or infectious diseases during the early post calving period, regardless of production, breed or management. One area of concern has been the negative association between the incidence of health disorders around calving and reproductive performance.

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Detection of Bovine Herpesvirus 1 in cattle genital organs

Lucas Pantaleon

Bovine herpesvirus 1 (BOHV-1) is a virus that causes Infectious Bovine Rhinotracheitis (IBR), infectious pustular vulvovaginitis, temporary infertility, embryonic death and abortions in cattle. The virus affects herds around the globe, causing significant economic losses. As is the case for other herpes viruses, BoHV-1 has the ability to establish a latent infection, meaning that animals are carriers for life and can infect other animals after viral reactivation.

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Evaluating Moringa oleifera as an alternative feed for dairy cows

Francisco E. Contreras Govea, Ph.D

Conventional forages for lactating cows in the USA are corn silage, alfalfa, grass, and winter cereals. However, in other countries, searching for alternative forage crops to feed dairy cows is a high priority. Moringa oleifera (Lam.), also known as drumstick tree, and horseradish tree is a deciduous tree from tropical and subtropical areas of India.

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Capítulo 5: Exploración del útero en la vaca no gestante sana Ficha 3: Cambios en el útero durante el ciclo estral

La pared del útero está formada por una capa serosa externa (perimetrio), una capa intermedia de músculo liso (miometrio) y una capa interna mucosa (endometrio). El endometrio al verlo en un corte histológico está formado por un epitelio cilíndrico simple ciliado y el estroma que lo sostiene (la capa inferior) contiene una gran cantidad de glándulas tubulares simples.

Durante el desarrollo del ciclo estral estas glándulas sufren cambios cíclicos para poder ofrecer las mejores condiciones para la implantación del zigoto.

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