FERTILITY and REPRODUCTION

How to boost cow's Fertility when we are short in grass

FERTILITY and REPRODUCTION

Successful pasture-based systems are reliant on achieving a good fertility performance, thereby allowing a compact calving period that coincides with the onset of spring pasture growth. Nutritional management has a key role to play in achieving fertility targets. Development of nutritional strategies to favourably impact metabolic indicators that regulate the reproductive axis should be prioritized.


The right BCS at calving (4.75 to 5) and minimizing postpartum BCS loss (⩽0.5 BCS units) are key drivers of herd fertility performance. Nutritional management must revolve around achieving these goals. Blood metabolites and metabolic hormones linked to fertility outcomes are now well characterized. In general, fertility variables have favourable associations with circulating concentrations of glucose, insulin and IGF-1 and unfavourable associations with non-esterified fatty acids, β-hydroxybutyrate and endogenous growth hormone. Nutritional strategies to impact these metabolic indicators have been utilized, but effects on herd fertility are inconsistent.

Last season fertility in dairy cow was not the best, very high empty rates and low conception rate was a big issue last spring. Weather conditions (means less grass) and “low pay-out” (means less prevention) probably were the most important reason involve in it.

With low dry matter, and low sugar content (low energy) due to the weather conditions; less grass available means fewer energy, vitamins and minerals in the system. Vitamins A, D and E have all been implicated as having a role in maintaining normal reproduction, usually, A and E come from grass in optimum amount dairy cows, and vitamin D3 is produced by the cow's thanks to sunlight, all these together can result in low fertility.

High pasture diet usually supplies enough fat and the right fatty acids to support a good fertility, but when we are shorter in quality and quantity supplementation of fat can help to keep reproduction on track. Fat supplies the building blocks for the production of progesterone (the hormone of pregnancy) which is essential to maintain the developing embryo.

Insufficient progesterone results in embryo death and pregnancy failure. Adding fats to diets can improve the development of eggs. This leads to higher quality, more viable eggs, which are more likely to sustain a pregnancy.

Sugars content in grass increase significantly with sunlight, sugar in blood had been associated positively with fertility, also help rumen bacteria to manage the nitrogen in a more effective way and avoid high urea in the blood.

NUTRIMIX has redesigned the mating booster formulas according to these conditions.

Depend on your farm system we recommend the supplementation of your cows, started 15 days before start mating:

Farms system 1 and 2: TOPMIX MATING BASIC: It is an energy booster based on a combination of vegetal oil, different sugar sources and a rumen nitrogen controller to remove of surplus nitrogen from the diet. The concept of the product is to put high energy in the body, improve the utilization of grass and avoid extra energy cost of high protein grass.

Farms system 3-4: TOPMIX MATING PLUS: Similar to MATING BASIC plus rumen-protected bypass fat and vitamins.

Farms system 5: TOPMIX MATING ELITE: 50% rumen-protected bypass, sugars, vegetal oil, vitamins, phosphorus and organic selenium.

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