• The vitamin and mineral content of porcine and bovine colostrum is identical.


SOW MILK During the days post-farrowing, the milk’s fat content will gradually go up, where dry matter and protein content will come down. As from day seven to ten, the milk’s composition will remain stable. Sow milk consists of protein, fats, carbo- hydrates, minerals and vitamins. A few of these ingredients deserve closer attention. The most prominent source of carbohydrates in sow milk is lactose. In colostrum the percentage of lactose was still rela- tively low, but at this stage the percentage is higher. Between sows, the percentage of lactose does not vary as much. Fats, on the other hand, are the largest and most fluctuating component in sow milk between sow’s. The amount depends e.g. on the sows nutrition. Sow milk contains the same type of immunoglobulins as colostrum, just in lower percentages. Especially the amount of IgA will remain relatively high and will be created by the sow during her entire lactation phase – and distributed through the milk. This immunoglobulin will protect piglets from intestinal infections.


Cow milk Table 2 also shows that sow milk, when compared to cow milk, has a higher dry matter content and a higher amount of fat content. When zooming in at milk on dry matter basis, it becomes apparent that cow milk has a higher protein percentage. Just like cow milk, sow milk has a casein component and a whey component. In cow milk, however, the amount of casein is higher when viewed on a dry matter basis. In terms of fatty acid content, cow milk and sow milk are comparable. The same applies to lactose, the source of carbo- hydrates which can be absorbed quickly by young animals.


Milk replacers – how do they work? So, both for colostrum as well as milk, dairy products can be a replacement. A dairy approach, however, also offers an advantage, which is related to the fact that the piglets’ digestive systems initially being oriented towards milk digestion. In those first weeks, all non-milk components will not be digested sufficiently, leading to diarrhoea. The transfer from milk towards vegetable-based solid feed – at weaning – is therefore a tremendous challenge, causing a changed intestinal microbiota, feed intake, and a pH value in the stomach. This is where a dairy milk replacer can make a difference. The three-step milk replacer series by Schils, the Netherlands, for instance, are spray-dried, homogeneously emulsified vegeta- ble-based fats with a relatively high level of coconut oil and lactose. These dairy proteins provide a rapid recovery of the pH in the stomach, quicker than other proteins would do. Acids


present include short chain fatty acids, which are often more easily digestible for young animals than long-chain fatty acids.


How do piglets perform on milk replacers? In 2018, Schils had a trial set up at the Swine Innovation Centre (VIC), part of Wageningen University, the Netherlands. Litters of 40 gilts and sows joined in the trial – one half formed the control group, with the piglets receiving a regular pre-starter twice a day as from day 2 after farrowing. The other half received support of the Pigipro ALFF (Automatic Liquid Flexible Feeder), 24 times a day, a limited quantity every time. Weaning occurred at 28 days in both groups. The trial yielded that at weaning, piglets in the group receiving support were heavier than the piglets in the control group. At 14 days of age, the piglets in the group receiving support were 530 g heavier than those in the control group – a weight difference that grew towards the end of the weaning phase. In comparison to the control group, 21% more piglets were weaned with a weight of more than 8 kg, and 3.6% fewer piglets were weaned with a weaning weight of lower than 6 kg. In addition, the research team found, the intake of the milk replacer did not reduce the intake of the weaner diet but rather increased the overall feed intake.


Table 2 - Comparison of sow milk and cow milk. Sow milk Sow milk (dry matter basis) Cow milk Cow milk (dry matter basis)


Dry matter (%) 18.7 Protein (%)


Casein (%) Whey (%)


Fat (%)


Lactose (%) Ash (%)


12.5


5.5 29.4 3.4 2.7 2.2


14.4 11.7


4.8


2.6 0.8


7.6 40.6 3.9 5.3 28.3 4.8 0.9


0.8 ▶ WEANING | JUNE 2020


27.2 20.8 6.4


38.4 31.2 6.4


23


Piglets enjoying a milk replacer of dairy origin.


PHOTO: SCHILS BV


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