Table 6. — Ash and mineral content per 100 



grams of diet, and suggested requirements for the rat 

























Ratio — 



Diet 



Ashi 



Calcium 



Phos- 

 phorus 



Iron 



Copper 



Sodium 



Potas- 

 sium 



Mag- 

 nesium 



Man- 

 ganese 



Boron 



Calcium: 

 Phos- 

 phorus 





Grams 



Grams 



Grams 



Mg. 



Mg. 



Grams 



Grams 



Mg. 



Mg. 



Mg. 





Stock 2 . 



10. 

 3.6 



2. 17 

 .56 



1. 22 

 .52 



17 

 14 



0.7 

 1. 5 



0. 64 

 . 16 



0.59 

 . 78 



290 

 83 



3.20 

 . 66 



0. 14 



1. 8 



SP8HV0 3 



1. 1 



SPE 3 



3. 1 



. 41 



.51 



14 



. 9 



. 22 



. 68 



72 



. 51 



. 13 



.8 



SPM « 



3. 9 

 3. 1 



. 58 

 .36 



.42 

 .45 



12 



12 



. 8 

 1. 1 



. 18 

 . 13 



. 81 



.77 



57 

 67 



. 46 

 . 45 



. 12 



. 17 



1. 4 



SPB 3 



. 8 



SPPB 3 . 



3. 1 



3.6 



. 46 

 . 56 



.48 

 .52 



14 



14 



1.0 

 1. 5 



. 15 

 . 16 



.95 



. 78 



110 

 83 



1. 50 

 . 66 



. 32 



. 14 



1. 



SP 16 HVO 4 



1. 1 



SP 8 lard 4 



3. 6 



.56 



.52 



14 



1.5 



. 16 



.78 



83 



. 66 



. 14 



1. 1 



SP 16 lard 4 



3.6 



. 56 



. 52 



14 



1.5 



. 16 



.78 



83 



. 66 



. 14 



1. 1 



SP 8 butter 4 



3.6 



. 56 



.52 



14 



1.5 



. 16 



.78 



83 



. 66 



. 14 



1. 1 



SP 16 butter 4 



3. 6 



. 56 



. 52 



14 



1. 5 



. 16 



.78 



83 



. 66 



. 14 



1. 1 



SPa 16HV0 4 



4. 1 



.54 



.51 



13 



. 9 



. 16 



.98 



85 



.46 



.06 



1. 1 



SPb 8 HVO* 



4. 1 



.54 



. 51 



13 



. 9 



. 16 



.98 



85 



.46 



.06 



1. 1 



SPEW 4 



3. 3 



.47 



.43 



11 



. 7 



. 22 



.93 



82 



. 40 



.06 



1. 1 



SPEY 4 



3. 3 



.43 



.54 



11 



. 6 



. 14 



. 69 



61 



. 34 



.06 



. 8 



SPW 8HV0 4 



4. 4 



. 54 



. 44 



12 



.7 



. 35 



1. 18 



104 



. 45 



.03 



1. 2 



E100 3 



3. 5 



.21 



.62 



8 



. 4 



. 40 



. 50 



42 



. 18 



. 17 



.3 



Y100 3 



3. 2 



.24 



.72 



8 



2 



. 11 



. 13 



16 



. 13 



. 10 



. 3 



Range for diets : 





High 



10. 



2. 17 



1.22 



17 



1. 5 



. 64 



1. 18 



290 



3.20 



. 32 



1. 8 



Low _ 



3. 1 



. 21 



. 42 



8 



. 2 



. 11 



. 13 



16 



. 13 



.03 



. 3 



Estimated require- 

























ments: 5 

























Young rat 





50-. 60 



. 45-. 55 



2. 5 



. 5-1. 



.07 



. 15 



5 



6 5 



.008 



1:1-2:1 









1 Analyzed values. 



2 Except for ash values, data supplied by manufacturer. 



3 Analyzed spectrochemically by A. W. Specht and J. W. 

 Resnicky, Soil and Water Conservation Research Division, 

 Agricultural Research Service, Beltsville, Md. 



Table 7. — Calorie values per 100 grams of diet, 

 and percentage of calories as carbohydrate, fat, 

 and protein 



4 Calculated from ingredients. See appendix table 78. 



6 Source: McCoy (122). 



6 Minimal requirements for reproduction. 



Body Weight and Longevity as Influenced 







Percentage of gross 





Heat of 



calories as 





Diet 



com- 

 bustion 



















Carbo- 



Fat 



Protein 







hydrates 









Calories 









Stock 



1399 



47 



14 



39 



SP8 HVO 



J 470 



50 



19 



31 



SPE 



J520 



35 



32 



33 



SPM 



!493 



41 



32 



27 



SPB 



J 520 



33 



35 



32 



SPPB 



1498 



39 



33 



28 



SP 16 HVO 



1504 



1470 



1503 



470 



503 



40 

 50 

 40 

 50 

 40 



32 

 19 

 32 

 19 

 32 



28 



SP 8 lard 



31 



SP16 1ard__. 



28 



SP 8 butter 



31 



SP 16 butter 



28 



SPa 16 HVO 



506 



35 



31 



33 



SPb 8 HVO 



468 



44 



19 



36 



SPEW 



511 



37 



30 



33 



SPEY 



523 



38 



33 



29 



SPW 8 HVO 



460 



52 



18 



30 



E100 



684 

 739 



2 

 3 



59 

 74 



39 



Y100 



23 



Range for diets: 











High 



739 



52 



74 



39 



Low 



399 



2 



14 



23 



1 Analyzed values; all other values were calculated by 

 using 5.65 Calories per gram for protein, 4.00 Calories per 

 gram for carbohydrates (chiefly sucrose), and 9.3 Calories 

 per gram for fat. 



it 



Body weight, intake, and age (stock, SP 8 HVO, and 

 SPE 



Weight gain in relation to food intake 

 (SP 8 HVO and SPE diets) .—Records of food 

 intake and weight throughout life were maintained 

 for 44 rats fed SP 8 HVO diet and for 38 rats fed 

 SPE diet, and included 4 separate experimental 

 groups of animals allocated for longevity studies 

 on each of these diets. Data for individual groups 

 as well as average values for all animals are sum- 

 marized in appendix tables 79 and 80. Figure 1 

 represents graphically the average food intake and 

 gain in weight of these rats from weaning until 300 

 days of age, a period relatively uncomplicated by 

 the occurrence of excessive weight loss or death. 

 The general pattern of food intake and weight 

 gain was similar for both diets, although young- 

 rats fed SP 8 HVO diet tended to gain more slowly 

 than did those fed SPE diet. From the second 

 to the sixth week on the experimental diets, the 

 animals progressively increased their food intake 

 and maintained a relatively constant average rate 

 of gain of approximately 40 grams weekly on SP 8 

 HVO diet and of 45 grams on SPE diet. The rats 

 were still continuing to gain weight at 300 days 

 of age, although their intake was relatively 

 constant after the sixth week. 



11 



