replicate nature for health
A digestive system in harmony
As farmers we try to do the very best for our animals but artificial feeding can cause problems with raising calves.
The biggest issue calves battle with is fast teat feeding or bucket feeding. These systems put a calf’s digestive system under huge pressure resulting in nutritional diarrhoea, poor weight gains and suckling each other or surroundings post feeding.
So, why do these systems work against the calf and not with her? If we look to nature we can find the answer.
In a lactating cow Milk Let Down occurs when stimulation releases oxytocin into the blood stream. Oxytocin causes cells in the udder to contract and eject milk from the alveolus into the cisterns above the teats.
Oxytocin does NOT cause milk to flow from the teat. The teat canal must be physically opened to remove milk.
When a calf suckles from a cow she applies both positive and negative pressure (squeezing and sucking).
The squeezing stimulates the cow teat causing the oxytocin to be released.
The suckling overcomes the sphincter barrier, allowing the calf to remove milk from the teat.
She nurses slowly, up to 4 or 5 minutes per litre of milk and produces a lot of saliva.
The saliva that is produced has several key benefits to the calf
It contains natural antibiotic properties which is the calf’s first and main defence against infection.
Saliva contains essential enzymes like lipase for fat digestion.
The controlled flow into the abomasum gives the milk time to curd and for lactose to be absorbed. The curded milk is then passed into the intestines for absorption.
It is vital that lactose is primarily digested in the abomasum and not passed through to the intestines. The E-Coli present in the intestines multiply rapidly when in contact with raw milk or lactose. This is a leading cause of nutritional diarrhoea in young calves.
The slow, controlled delivery of milk allows the oesophageal groove to function correctly.
The oesophageal groove is often overlooked but its correct function is critical to calf health!
It protects the rumen by directing milk to the abomasum.
It protects the trachea and lungs from milk.
The oesophageal groove is a curved muscle that lies in the throat of the calf. It ensures that everything that enters the calf’s mouth, ends up in the right place.
When a calf has her head down and drinks water from a bucket or when she eats starter ration or forage, the oesophageal groove stays curved and open to direct these foods to the rumen for digestion.
The natural suckling action of using positive and negative pressure activates the oesophageal groove to close and form a tube so milk bypasses the Rumen and enters the Abomasum. This tube is small, so it is essential that milk delivery speed is slow so it does not overflow and enter the rumen or lungs.
Milk in the rumen can be catastrophic to calf health.
The rumen has enzymes to digest grains and forage. These enzymes have no ability to digest milk which ferments producing lactic acid as a by-product. The lactic acid enters the bloodstream of the calf and can cause depression, anorexia and occasionally death.
It is vital to the health of the calf that all the milk goes into the abomasum. If milk enters the rumen through fast feeding, tube feeding or bucket feeding, it can cause gut ache, as the enzymes in the rumen cannot digest milk. Milk in the rumen is a key contributor to rumen acidosis and ill thrift.
Source - Dr. Jim Quigley
This demonstrates the Oesophageal Groove when relaxed.
When a calf is drinking water from a trough or eating grain or forage the Oesophageal Groove muscles are relaxed and the water or food drops into the Rumen for digestion.
This demonstrates the Oesophageal Groove when a calf suckles from a teat.
The muscles tighten to form a tube to direct milk to the abomasum.
Fast feeding can overflow the tube so milk can enter the rumen.
‘The initial digestion of milk occurs in the abomasum (or fourth stomach). Scours can usually be traced back to a failure of adequate milk digestion in the abomasum. Nutritional scours is simply the end result of an oversupply of lactose in the intestines, caused by milk moving too rapidly out of the abomasum, so it cannot be broken down quickly enough. Nutritional scours often progresses to infectious scours. Pathogens use excess lactose as a nutrient source to increase in numbers. Source- Victoria Department of Primary Industries.
Through, slow controlled suckling and saliva production, the digestive system is in harmony and the calf does not suffer from nutritional diarrhoea or rumen acidosis.
By creating the Milk Bar Teat we have followed the principles of nature as closely as possible.