Table 2.
Analyseda chemical composition of two semi-purified diets with an adequate or low selenium concentration
| Component (g/MJ, except where specified) | Adequate Se diet | Low Se diet |
|---|---|---|
| Dry matter (g/100 g as is) | 92.8 | 92.7 |
| Crude protein | 14.9 | 14.9 |
| Crude fat | 5.8 | 5.8 |
| Crude fibre | 1.6 | 1.5 |
| Nitrogen free extractb | 35.5 | 35.4 |
| Starch | 13.6 | 13.1 |
| Crude ash | 2.5 | 2.4 |
| Metabolisable energy (MJ/kg DM)c | 16.6 | 16.7 |
| Amino acids | ||
| Arginine | 0.38 | 0.40 |
| Histidine | 0.21 | 0.21 |
| Isoleucine | 0.38 | 0.37 |
| Leucine | 0.68 | 0.68 |
| Lysine | 0.36 | 0.38 |
| Methionine | 0.32 | 0.36 |
| Cysteine | 0.36 | 0.36 |
| Phenylalanine | 0.45 | 0.47 |
| Tyrosine | 0.23 | 0.23 |
| Threonine | 0.47 | 0.47 |
| Tryptophan | 0.14 | 0.14 |
| Valine | 0.51 | 0.52 |
| Fatty acids | ||
| Linoleic acid | 1.35 | 0.96 |
| α-Linolenic acid (mg/MJ ME) | 91 | 113 |
| Arachidonic acid (mg/MJ ME) | 22.6 | 9.3 |
| EPA & DHA (mg/MJ ME) | 6.9 | 6.5 |
| Minerals (mg/MJ ME) | ||
| Potassium | 416 | 414 |
| Calcium | 383 | 388 |
| Phosphorus | 299 | 304 |
| Chloride | 123 | 110 |
| Sodium | 97 | 91 |
| Magnesium | 58.4 | 58.2 |
| Zinc | 6.5 | 6.5 |
| Iron | 3.4 | 3.9 |
| Copper | 0.48 | 0.68 |
| Manganese | 0.73 | 0.57 |
| Iodine | 0.08 | 0.08 |
| Selenium (μg/MJ ME) | 46.1 | 6.5 |
| Vitamins (mg/MJ ME) | ||
| Choline | 148 | 146 |
| Biotin | 46.1 | 39.3 |
| Niacin | 5.5 | 4.9 |
| Pantothenic acid | 1.8 | 2.0 |
| d-α-tocopherol | 1.8 | 1.8 |
| Riboflavin | 0.45 | 0.44 |
| Thiamin | 0.24 | 0.27 |
| Pyridoxine | 0.14 | 0.22 |
| Retinol | 0.16 | 0.16 |
| Menadion (μg/MJ ME) | 71.4 | 90.6 |
| Folic acid (μg/MJ ME) | 53.2 | 45.2 |
| Cyanocobalamin (μg/MJ ME) | 35.6 | 37.5 |
| Cholecalciferol (μg/MJ ME) | 1.13 | 0.94 |
MJ megajoule, ME metabolisable energy, EPA Eicosapentaenoic acid, DHA docosahexaenoic acid
aAll analyses were performed by Eurofins Food Testing, Wolverhampton, UK
bCalculated by substracting the amount (as g/100 g as is) of crude fat, protein, ash and fibre from the percentage dry matter and dividing this by the metabolisable energy concentration (MJ/kg as is)
cCalculated using predictive equations for ME (NRC, 2006)
Both dog groups received the adequate Se diet in the 8-week pre-feeding period. Dog group A continued to receive the adequate Se diet in the 8-week experimental period and dog group B switched to the low Se diet