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Myrthe Gilbert
bij Myrthe Gilbert in Gelderland
Replacing lactose by processed plant polysaccharides for calf nutrition
Thesis opportunity at Animal Nutrition for MSc students
Background information:
In veal calves, the vast majority of energy intake is from milk replacer. This milk replacer typically contains 20% protein, 20% fat and up to 45% of lactose on a dry matter basis. Lactose mostly originates from whey, which has been subjected to large economic fluctuations during recent years. Milk replacer producers as well as the ingredient suppliers are therefore exploring alternative carbohydrate-rich ingredients, including starch (hydrolysates) or technically modified carbohydrate by-products.
However, alternative carbohydrates should meet very specific requirements for being good candidates to replace lactose. For example, the alternative has to be dispersible in water and should not deteriorate gastrointestinal health. Lactose has a high digestibility, approximately 95%, and can be added to the milk replacer in high amounts. Existing starch (hydrolysate) products usually have lower digestibilities and may result in diarrhoea when added in high amounts.
In addition, replacing lactose – consisting of glucose plus galactose – by other carbohydrates will likely yield another mixture of monosaccharides which may affect glucose homeostasis. Similarly, the rate of digestion and absorption may also differ between carbohydrate sources. Heavy veal calves are vulnerable to problems with glucose homeostasis, such as hyperglycemia, hyperinsulemia, insulin resistance and glucosuria, which may relate to an impaired animal performance. Apart from an efficient digestion, a successful replacer of lactose should therefore not lead to metabolic problems.
Thesis:
In this project there are opportunities for (major or minor) theses. Your thesis can consist of a literature overview, practical and laboratory work, as well as analysis of your obtained data. At this moment, an experiment with calves is being executed, which mainly focuses on the digestion of starch (hydrolysates), but also on glucose homeostasis after milk ingestion.
More information:
Would you like more information or an appointment? Contact Myrthe Gilbert, myrthe.gilbert@wur.nl or 0317-482165.
Thesis opportunity at Animal Nutrition for MSc students
Background information:
In veal calves, the vast majority of energy intake is from milk replacer. This milk replacer typically contains 20% protein, 20% fat and up to 45% of lactose on a dry matter basis. Lactose mostly originates from whey, which has been subjected to large economic fluctuations during recent years. Milk replacer producers as well as the ingredient suppliers are therefore exploring alternative carbohydrate-rich ingredients, including starch (hydrolysates) or technically modified carbohydrate by-products.
However, alternative carbohydrates should meet very specific requirements for being good candidates to replace lactose. For example, the alternative has to be dispersible in water and should not deteriorate gastrointestinal health. Lactose has a high digestibility, approximately 95%, and can be added to the milk replacer in high amounts. Existing starch (hydrolysate) products usually have lower digestibilities and may result in diarrhoea when added in high amounts.
In addition, replacing lactose – consisting of glucose plus galactose – by other carbohydrates will likely yield another mixture of monosaccharides which may affect glucose homeostasis. Similarly, the rate of digestion and absorption may also differ between carbohydrate sources. Heavy veal calves are vulnerable to problems with glucose homeostasis, such as hyperglycemia, hyperinsulemia, insulin resistance and glucosuria, which may relate to an impaired animal performance. Apart from an efficient digestion, a successful replacer of lactose should therefore not lead to metabolic problems.
Thesis:
In this project there are opportunities for (major or minor) theses. Your thesis can consist of a literature overview, practical and laboratory work, as well as analysis of your obtained data. At this moment, an experiment with calves is being executed, which mainly focuses on the digestion of starch (hydrolysates), but also on glucose homeostasis after milk ingestion.
More information:
Would you like more information or an appointment? Contact Myrthe Gilbert, myrthe.gilbert@wur.nl or 0317-482165.
Gepubliceerd 17-11-2011
Aantal keer bekeken: 162 keren
Aantal keer bekeken: 162 keren