Effects of dietary n-3 polyunsaturated fatty acids and ... - FINS

1 st WorkshopXIII International Feed Technology SymposiumTable 4. Nutrient Requirements of goat (17)ParameterBodyweight, kgDrymatterintake,kgEnergy RequirementsProteinRequirementsTDN kgdME Mcal-MP,g-d DIP, g -dMature goats, early lactation, milk yield 2,06 – 3,22 kg40 1,97 1,05 3,77 178 9450 2,30 1,22 4,41 205 110Mature goats, mid lactation, milk yield 1,47 – 2,30 kg40 1,96 1,04 3,74 156 9350 2,26 1,20 4,33 178 108Mature goats, late lactation, milk yield 0,88 – 1,38 kg40 1,69 0.89 3,23 121 8150 1,96 1,04 3,75 140 94Mature bucks, prebreeding50 1,36 0,72 2,59 58 6575 1,84 0,97 3,51 78 88Protein value of nutrients is expressed in a new way in this system, in metabolizableprotein (MP), protein requirements are also stated in rumen-degradable proteinbalance. The protein requirement for lactation suggested in the NutrientRequirements of Goats (16) was based on a digestible crude protein system for dairycattle - NRC 1978 (15) due to a lack of adequate data from studies with lactatinggoats. This method of calculation resulted in a suggested requirement of 72 grams oftotal crude protein per kilogram of milk (15).As shown in Table 5, additional data has indicated a reduction of over 15% in therecommended protein intake for maintenance for mature goats from the 1981 NRC(16) level.Table 5. Energy & protein requirements of a 70 kg mature goat (16, 20, 21, 22)NRC 1981 2004ME mJ 10.26 11.18aCrude Protein, g 96.3b 81.7ca based on Luo et al. (20,21) value of 462 mJ ME/ kgW0.75b NRC (16) C P requirement = Mcal DE * 32c table 7 Sahlu (22) converted to crude protein utilizing NRC 1996However, estimated energy requirements have been increased almost 9%. Thesechanges can be attributed to a much larger database for calculating the values but,also a better understanding of the partitioning of nutrients to various body functions.The nutrient requirements of growing goats (Table 6) show a different trend thanthose of mature animals. Protein recommendations increase by over 45% whileenergy recommendations increase very little. However, it must be remembered that159