REPRODUCTION STARTS IN THE LIVER
The liver doesn’t often get the attention it deserves. Tucked behind the rumen and largely invisible to farm-level observation, it quietly carries the burden of
The liver doesn’t often get the attention it deserves. Tucked behind the rumen and largely invisible to farm-level observation, it quietly carries the burden of
Among the organs crucial to a cow’s overall health and productivity, the liver stands out as a powerhouse of metabolic activity and immune function. We
Prior to the 1600’s the liver was considered to be the most important organ in the body, much more so than the heart and the brain. Throughout the ages this organ has been steeped in myth, in the case of the Romans, the liver held a key place in their religious rituals. Roman priests closely studied sacrificed animal livers, these signs could indicate such things as, prosperity, famine, wars, or curses.
Today, the heart and the brain seem to have more emphasis placed on their importance. However, the ancients may have known more than we give them credit for, we should not be too quick to dismiss the liver. Regardless of the heart and brain, without a functional liver most living creatures would not survive very well, or for very long.
The liver is fascinating, and in many ways, I find it to be the most complex of all the bodies organs. It is a single organ with a massive number of functions, below are just a few of the key functions.
Key functions of the liver
• The production of bile – bile clears waste products.
• Produces many blood proteins, e.g. albumin, ferritin, cholesterol etc.
• Produces lipoproteins that carry different fats throughout the body.
• Controls energy – rapidly converts glucose to glycogen (storage) and then rapidly converts glycogen back to glucose as the body calls for more energy.
• Regulates amino acids, the building blocks of protein within the blood.
• Regulating (storing and releasing) hemoglobin levels of minerals such as iron, copper, etc
• Conversion of excess ammonia to urea (a major issue in ruminant digestion)
• Clears toxins from the blood (think feed toxins, aflatoxins, mycotoxins, ergot toxins)
• Important in the immune response in that the liver detects and clears bacteria and viruses arriving from the gut.
• Regulates blood clotting
• Clears bilirubin (broken down red blood cells) from the blood.
These are just a few of the key processes involving the liver. You can see from the list that these are all very essential processes. They are all reliant on a healthy liver, with enough capacity to consistently carry out every single function.
Minerals and the Transition Period
The Transition cow mob, more commonly referred to by farmers as the springer cow mob, has the potential to respond to a higher level of thought and attention. Making key decisions around feeding and supplementation of this mob can have a bigger impact on a dairy farm’s profitability than any other single set of management decisions made throughout the rest of the season. A well transitioned cow will normally produce more total milk, have less disease issues, and a better reproductive outcome, than cows that don’t receive as much attention around this time.
Most experts agree that the transition period begins 21 days prior to the day the cow gives birth, into 21 days of lactation. For any cow this is a period of vast metabolic change. During this time their hormone levels are going through rapid developments as the body gets ready to mobilise many of the key minerals required, as well as preparing her body to mobilise the vast amounts of energy required during birth and lactation. Transition is normally the single highest stress period a cow will experience each year.
A TIME NOT TO DO THINGS BY HALVES
Both the period prior to calving and the period after calving are equally important to ensure the cow will produce at her potential, remain healthy and conceive again when mated. In my experience farmers will tend to either concentrate on the period leading up to calving or the period after – most commonly the period after calving gets most attention. And this can create a problem. In this article we will concentrate on the transitioning of cows only, rather than heifers (first calvers) where the focus need only be on ramping up the feed rate prior to calving. Transitioning cows is a very different process, a cow that is not transitioned correctly leading up to calving is a cow that will calve with her metabolic processes operating well short of full potential. She will be more exposed to both clinical and subclinical metabolic disease through either being calcium deficient or lacking the ability to mobilise sufficient calcium, ketosis, fatty liver disease, or possibly a combination of these problems.
FATTY LIVER AND KETOSIS DISEASES OR DEFICIENCIES Fatty Liver and Ketosis in Dairy Cows: Metabolic Diseases or Nutritional Deficiencies? An overweight dairy cow entering early