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NASEM 2021 Protein & amino acid requirements in dairy cows

Fri, 05 Nov 2021 14:55:13 GMT

Webinar held on September 30th 2021

The webinar introduces new information on dairy cows recommendations from the US National Academies of Sciences, Engineering, and Medicine (NASEM, previously known as NRC).

Dr Hélène Lapierre, Researcher and scientist for Agriculture and Agri-Food Canada's Sherbrooke Research and Development Centre, is presenting this webinar.

Her research aims to improve the efficiency of Nitrogen utilization through a better knowledge of intermediary metabolism of dairy cows.

Dr. Lapierre is a co-author of the NASEM committee focusing on the protein and amino acid requirements.

Webinar #1: Oxidative Stress in Animal Production

Thu, 04 Mar 2021 10:00:39 GMT

Speakers: Prof Peter Surai, Dr Mario Estevez and Dr. Pierre-André Geraert

The basis of oxidative stress (Prof Peter Surai) and its impact on meat quality (Dr Mario Estevez) & share questions and answers during the roundtable.

Questions and Anwers

Q: A comment on flavonoïds, even if they are absorbed at low level some of them play an indirect role in inducing at gene level endogenous antioxidant systems.

Reinforcing the anti-oxidant defenses of the gut definitely improve its resistance to aggressive factors such as dietary ones (induced by mycotoxins for instance) or induced by microorganisms (bacteria, virus). Polyphenols and flavonoids may bring antioxidant benefits reinforcing the host response to xenobiotics.

Q: Is there a significant difference on the meat between chicken fed with Organic selenium and another fed with mineral selenium?

We assume that you mean organoleptic properties: improving the antioxidant status of the meat often is "indirectly" perceived by consumers influencing their choice. The conservation of the meat is also improved reducing the changes in color, texture,.. during storage or processing. Drip losses are clearly reduced when birds receive an organic selenium source compared to a mineral one.

Q: Oxidative impaires male fertility .. What about female ?

Indeed, the spermatozoids are clearly affected by oxidation. But ovocytes and particularly their membrane is also rich in polyunsaturated fats and prone to oxidation. Most parameters linked to egg production such as the export of vitellogenin by the hepatocyte toward the ovary is conditioned by membrane phospholipids. Preserving them from oxidation will help to enhance fertility. Hatchability is also clearly affected by oxidative stress situations and can be restored by using the right antioxidant solution.

Q: You said free radicals are used as weapons against bacteria, play a role of messenger: what about (too) high antioxidant intake?

Indeed, you're right. Free radicals are normal elements in the metabolism that help our body to get rid of xenobiotics. Antioxidant have to be balanced and an excess of one will not compensate for a deficiency of another and might event counteract the benefits of their nature. Proposing a balanced of efficient antioxidant solutions is thus key to improve animal performance under challenging conditions.

Q: Is oxidative stress affecting fertility ?

yes indeed, hot conditions and ageing are good examples of oxidative stress that affect fertility. An optimal balance of antioxidants has long been shown to improve fertility in a wide range of animal species including human.

Q: Is oxidized fat in the diet a source of oxidative stress?

Yes, oxidized fat can induce some toxicity depending the level and thus increase oxidative stress to the animal. It has long been worked at, but nowadays it is sometimes difficult to link the actual used index (iodine, …) to the decreased performance. However, lipid peroxydes have clearly a negative effect on sensitive molecules to oxidation. Antioxidant systems can help to alleviate those negative effects, particularly the selenoprotein Glutathione peroxidase 2 have been demonstrated to detoxify different lipid peroxides.

Oxidative Stress in Animal Production Roundtable

Thu, 04 Mar 2021 09:59:49 GMT

Speakers: Prof Peter Surai, Dr Mario Estevez and Dr Pierre-André Geraert

Prof Peter Surai, Dr Mario Estevez and Dr Pierre-André Geraert held a Questions and Answers session on Oxidative Stress in Animal Production.

Webinar #1: Oxidative Stress in Animal Production
On the basis of oxidative stress (Prof Peter Surai) and its impact on meat quality (Dr Mario Estevez) & share questions and answers during the roundtable.

Importance & Considerations of Formulating Diets for AA

Mon, 18 May 2020 00:00:00 GMT

During this Webinar Chuck Schwab, Professor Emeritus, University of New Hampshire; Principal, Schwab Consulting is presentig his insights on: Importance & Considerations of Formulating Diets for AA Dr. Chuck Schwab clearly defines why amino acids (AA) are the nutrients required by the dairy cow not crude protein (CP) or metabolizable protein (MP). He dials in on the key considerations for the selection of ingredients to use in AA formulation, the challenges of estimating the intestinal lysine digestibility, particularly of heat treated proteins, and how to obtain reliable metabolizable AA concentrations for rumen-protected AA products.

Smart Science Series
Through the Smart Science Series of six webinars, explore the rewards of amino acid balancing and ration formulation. In the first five webinars, a university professor discusses the aspect in which he is the top industry expert. The sixth webinar is forward looking, as two university professors discuss aligning genetic potential with nutritional requirements for longevity and sustainability.