January 8, 2018
Fat Supplementation And Conception Rates
According to research, it is shown that fat supplements benefited conception rates of lactating dairy cows.
Average improvement seems to be 21% points.
With that being said, this does not mean feeding these fat supplements will increase herd conception rate by 21% points.
If fat supplement is to be beneficial to the farm, it is more likely that it will be less than 10% points.
Fish Meal And Conception Rates
Although main nutrient in fish meal is protein instead of fat, there has been growing evidence that oils unique to fish improves pregnancy in several studies.
The inclusion of fish meal in diet is usually around 3 - 7% of DM.
In some studies, fish meal partially replace soybean meal, thus reducing excessive intake of ruminally degradable protein.
Hence, it is possible that improved conception rates is due to elimination of negative effect of excessive intake of ruminally degradable protein on conception.
However, there are studies where concentration of ruminally undegradable protein was kept constant between dietary treatments, cows fed with fish meal still have better conception rate.
This could be due to the unique omega-3 polyunsaturated fatty acids in fish meal.
Oil Seeds And Conception Rates
There hasn't been much studies on oil seeds and their effects on conception rates.
Oil seeds may be a good candidate as they can deliver key fatty acids past the rumen.
However, many oil seeds contain more than 50% linoleic acid. Delivery of linoleic acid past the rumen to small intestine is not the same for all oil seeds.
If the increase in linoleic acid concentration of milk is used as an indicator, soybean appears to be the most effective while cottonseeds seem to be the most ineffective.
The processing of whole seeds also influence their ability to delivery unsaturated fat past the rumen.
Roasting of soybeans and sunflowers seemed to increase the delivery of linoleic acid.
As for linolenic acid, whole flaxseeds fed about 10% of diet can delivery some of its omega-3 fatty acid to the tissues.