Download A Fishkeeper’s Guide to Aquarium Plants: A Superbly by Barry James PDF

By Barry James

Ebook ON A FISHKEEPER'S consultant TO AQUARIUM crops.

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Extra resources for A Fishkeeper’s Guide to Aquarium Plants: A Superbly Illustrated Guide to Growing Healthy Aquarium Plants, Featuring over 60 Species

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This increased efficiency can be explained by hormonal changes in metabolism. 5 kg/day may be assumed, also that the maintenance need is the same as for as for the pregnant sow. 1 kg daily of a maize/soy diet. In the case of other classes of pigs which are fed ad libitum, the DE requirements are met by regulating the DE content of the dietary mixture. The main sources of energy are starch and fat. Very young weaned pigs need some simple sugars. Fibre is not well utilized and increased fibre in the diet may result in reduced digestibility of energy and protein.

Calcium and phosphorus Calcium and phosphorus make up over 70% of the mineral content of the pig body, mainly combined with each other. Approximately 80% of the phosphorus and 99% of the calcium in the body are present in the bones and teeth. These figures indicate the importance of calcium and phosphorus in the diet and the role they play in giving rigidity and strength to the skeletal structure. An inadequate supply of either one in the diet will limit the utilization of the other. These two minerals are discussed together because there is a close relationship between them.

3. Minerals required by pigs. Macro minerals Trace minerals Calcium (Ca)a Chlorine (Cl)a,c Magnesium (Mg) Phosphorus (P)a Potassium (K) Sodium (Na)a Sulphur (S) Cobalt Copper (Cu)b Iodine (I)c Iron (Fe)b Manganese (Mn)b Selenium (Se)b Zinc (Zn)b a Included as dietary ingredients. Included in a premix. c Normally included as iodized salt (NaCl). b 34 Chapter 3 Adequate calcium and phosphorus nutrition for all classes of pigs is dependent upon: (i) an adequate supply of each element in an available form in the diet; (ii) a suitable ratio of available calcium and phosphorus in the diet; and (iii) the presence of adequate vitamin D (NRC, 1998).

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