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Dairy cattle nutrition
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Global food demand is set to double by 2050 in line with UN estimates that the world population will increase from today’s 7.6 billion to reach 9.8 billion over the next 26 years. To keep pace with such growth, agricultural systems throughout the world will need to provide extra food to feed the rising number of people. While this is a daunting prospect, such enormous growth will also provide opportunities and challenge for the dairy sector as we seek to keep providing the global...
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The role of Actisaf® Sc 47 in modern dairy nutrition Improving feed efficiency is one of the most effective strategies to reduce GHG emissions, whilst still increasing milk production. As global demands shift from pursuing maximum output, irrespective of the resources used, to the pursuit of balanced sustainability in which efficient production is measured against environmental concerns and the use of finite resources, so similar changes in approach are...
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Dairy cows are often thought of as metabolic super athletes, requiring hard work and a herculean effort to achieve high milk production. In reality, it’s just the opposite. Productivity is an expression of health and vitality, not a result of the cow working under stress. Put a cow in a healthy environment, provide adequate nutrition and they’ll fully express their genetic potential in the form of exceptional milk production. Instead of involving hard...
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Overview The transition period is defined as approximately 21 days before and after calving, during which dry matter intake is restricted while the demand for nutrients increases rapidly and there are intense metabolic and hormonal changes which impact the whole lactation. These changes result in negative nutrient balance with attendant metabolic disorders and greater risk of disease incidences which affect foetal growth together with cow health, fertility, and milk production...
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1. Introduction Both L-glutamate (Glu) and L-glutamine (Gln) are abundant amino acids (AAs) in plant, microbial, and animal proteins [1]. In the whole bodies of sheep and cattle, Glu and Gln are the third and eighth most abundant AAs, respectively. For comparison, the total content of these two AAs, along with other AAs, in feeds [e.g., Bermuda grass, distillers dried grains, and solubles (DDGS)], ruminal microbes, and skeletal muscle proteins is also relatively high, as summarized...
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Dr. José Santos from the University of Florida discusses the essential role of choline in dairy nutrition during the conference titled "Choline: A Required Nutrient (Part II)." This content is brought to you by Balchem...
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Introduction Supplemental lipids are commonly included in diets for ruminants (Doreau and Ferlay 1994). These lipids are components of feedstuffs or through the addition of specific lipid additives (Loften et al. 2014). Most commonly, these lipid additives are used to increase the energy density of the diet (Hess et al. 2008), but can also be used to modulate the fatty acid (FA) composition of body tissues or induce metabolic changes. Verdugo (2016)...
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Our objective was to evaluate changes in choline metabolism including bacterial degradation to trimethylamine (TMA), methyl group transfer, and bioavailability in pregnant and lactating cows. Six multiparous, rumen-cannulated Holstein cows were enrolled in a study design where they were abomasally infused 18 g/d choline chloride (CC; dissolved in water; 170 mL/h) for a 5-d experimental period at −3 wk from expected due date and again at 2 wk postpartum. The stable-isotope...
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Current approaches to study choline bioavailability do not account for the ruminal or postruminal bacterial degradation of choline to trimethylamine (TMA) and TMA N-oxide (TMAO). To evaluate choline bioavailability, 8 multiparous Holstein cows (184 ± 109 d in milk) were enrolled in a study with a 4 × 4 Latin square design. Treatments were (1) 0 g/d of supplemental choline chloride (CTR), (2) 16.8 g/d of unprotected choline chloride (CC) delivered as a continuous ruminal infusion...
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The discovery of choline dates back to 1850s when French pharmacist, Théodore Gobley discovered a group of phospholipids that he named lecithin. Seventy years later, during the discovery of insulin by Frederick Banting, his student Charles Best noticed that depancreatized dogs developed hepatic lipidosis. Subsequently in the early 1930s, Best showed that supplementing lecithin reversed and prevented hepatic lipidosis in dogs and rats. It took another 67 years for dietary choline to be...
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A technique has been established to determine the TMR stability of rumen-protected (RP)-lysine products, but the TMR stability of RPcholine (RPC) products has not yet been explored. The objective of this experiment was to evaluate the TMR stability of 5 RPC products using a modified technique. Triplicate Ziploc bags containing RPC (equivalent of 1 g of choline chloride [CC]), no RPC (negative control), or unprotected CC (positive control; 1 g of CC) mixed with 200 g of TMR (38% DM) were...
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The TMR stability of rumen-protected lysine (RPL) products has been previously investigated, albeit without a positive control, potentially introducing bias. The objective of this experiment was to evaluate the TMR stability of 6 RPL products using a modified technique that used an unprotected Lys treatment as a positive control. Triplicate Ziploc bags containing RPL (equivalent of 1 g of Lys), no RPL (negative control) or unprotected Lys-HCl (positive control; 1 g of Lys) mixed with 200 g...
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Amino acids (AA) undergo complex metabolism for protein synthesis or excretion after oxidation. We investigated the fate of metabolizable Lys via continuous abomasal infusion of 15 N-Lys. Four rumen-cannulated Holstein cows (147.0 ± 63.2 d in milk, 49.4 ± 9.5 kg milk yield) received 0.6 g/d of 15 N-Lys into the abomasum for 5 d. Cows were offered a common diet (16.6% crude protein; 89% of metabolizable Lys requirement) once daily for an ad libitum intake....
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Choline supplementation is known to modify hepatic lipid metabolism in the dairy cow, but little is known about its effect on mammary lipid metabolism. The objective of this study was to characterize the effect of increasing doses of abomasally infused choline on milk production and milk lipids using untargeted lipomics. A total of 12 ruminally cannulated Holstein cows were used in a 4 × 4 Latin square design with 7-d experimental and 7-d rest periods. All cows were fed a common TMR...
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A lot of information has been published in the last decades, dealing with the negative effect of summer heat stress on the productive and reproductive traits of the high yielding cow. Very limited information existed however, up until the last years, on the effect of heat stress on the feed efficiency of cows (as estimated by the feed to milk ratio). Knowing the full extent of the economic losses caused to the cows due to heat load can help to present to the dairy farmers...
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Choline is a methyl donor, which may influence DNA methylation, gene expression, and cellular processes. Past studies have found an increase in milk yield when periparturient dairy cows were supplemented with dietary rumen-protected choline (RPC); however, the mechanism behind this response is unknown. Therefore, the objective of this study was to assess the effects of dietary RPC supplementation on mammary epigenome-wide DNA methylation. Parous Holstein cows were blocked by calving month...
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Yeasts are single-celled, facultative anaerobic eukaryotes that are prevalent in various fermented feeds. Yeasts can negatively affect silage quality by metabolizing available nutrients within the feed which leads to dry matter loss and decreased nutritive value, and by producing ethanol which can lead to off flavors in milk when consumed. Yeasts also oxidize lactic acid, which increases silage pH and promotes the growth of organisms such as mycotoxin-producing molds. Although wild yeasts...
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Sir how much % rice ddgs can be used in 100kg feed formulation to prevent sulphur toxicity and less intake of feed ? ...
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Dr. José Santos (University of Florida) showed the results of some experimental designs using choline in dairy cows, during the conference titled "Choline: A Required Nutrient (Part III)." This content is brought to you by Balchem...
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