134 PRINCIPLES OF FEEDING FARM ANIMALS 



recommended that Table 30 of the Appendix be used as 

 representing the digestible nutrients in the feeds. 



Savage and Henry and Morrison have presented standards 

 for growing horses. The Henry-Morrison standard is 

 given in Table 33 of the Appendix. According to Savage ^ 

 growing horses from 6 months to 2 J years of age should receive 

 18 pounds of dry substance, 1.7 pounds of digestible protein, 

 and 12.0 pounds of total nutriment per 1000 pounds Hve 

 weight. The ration should have a nutritive ratio of 1 : 6.1. 



Requirements for Pregnant Animals. — The development 

 of the foetus in the dam requires protein and mineral matter. 

 Hence the ration of the mature pregnant animal should con- 

 tain protein and mineral matter in addition to the mainte- 

 nance requirements. In case of a young pregnant animal, 

 which is still growing, additional protein and mineral matter 

 above the ordinary requirements must be supphed or the 

 foetus will be only imperfectly developed at the expense 

 of the tissues of the dam. If the pregnant animal is pro- 

 ducing milk, or is working, in addition to carrying a foetus, 

 additional energy as well as protein and mineral matter 

 should be supplied. For example, a mare which is bred, is 

 suckUng a foal, and is doing ordinary farm work should have 

 a ration containing more protein and energy than the mare 

 or gelding which is working only. 



Requirements for mature breeding ewes, mature brood 

 sows, and mature brood mares doing no work are given by 

 the Wolff-Lehmann and Henry-Morrison standards. In 

 feeding breeding animals care should be taken not to get 

 them too fat, as this often produces barrenness in the female 

 and steriUty in the male. 



1 Cornell Agr. Exp. Sta. Bui. 321. 



