56 BULLETIN 1121, U. S. DEPARTMENT OF AGRICULTURE. 
TABLE 26.—Number of young raised to weaning (33 days) during successive 3-month 
periods, 1916-1919. Inbreeding and crossbreeding experiments. 
1916 1917 1918 1919 
Beper ee ee! Toe 
1-3 | 4-6 | 7-9 |10-12) 1-3 | 4-6 | 7-9 |10-12) 1-3 | 4-6 | 7-9 |10-12) 1-3 | 4-6 | 7-9 |10-12 
2 14| 36| 47 29 155 |) BW) 14] 38) 34 24.) 31 SoMa dane Souk GOnin ae 597 
13 20 | 24) 43 24 17 6 19 17 15 4 WL 30 | 28; 50} 49! 33 390 
32 17 13 29 16 3 16 14 16 8 8 11 15 als: Pree Pal 265 
35 5 PANN PY Bi Bl 19 145i) SOmpo2ale oO 11 28 I oONleoOnin oO 42 | 538 485 
Oe pee 13 745) |) 253 15 6 13 7 16 7 8 3 3 13 12 9 18 191 
Other 70 | 81/102) 78; 42) 60 5 31 9 7 6 Dig | PE ee eR by as a 544 
Inbred 159 | 206 | 279 | 193 | 102 | 139 | 137 | 150 | 103 62 | 90 | 144 | 166 | 188 | 187 | 167 2,472 
ae dy aveiard teens 16 62 54 | 63 | 103 | 110 79 75) |) BS? 31 43 43 50 66 63 871 
RS Ra Ate a a at 4 7 11 5 10 6 11 20 20) 68 | 91 55 | 315 
DNC Operas ee See SR beh em ce" be, te 1 5 17 1025 9 22 | 391! 60) 104/]°85 | 83 | 435 
CLOT LERERE Sel ieee Pat ae ae 1 8 12 4] 74 | 74 59 | 441! 37) 45 HS) Vee Sea al 3 S| 413 
OIE opal lbs alow 8 12 40 55 7 59 41 39 46 29 20 ‘ONS. See 428 
OP] een P| HE Ie |p een |S eer | ame elt ne 2 Tit 9 13 9 15 26 24 10 5 1 125 
Cs a RIS Falls palin ce alle Cee sees Meee alae Se 2a LOn eet 16 27 | 35} 69 67 | 44 281 
Cees ae dlee ania £8 oj5 SE Sioa cisk al ae eae cick 18 | 19 | 28 22 | 48) 61 80 | 64) 47 387 
Bees .ctoe 74! 60) 97 75 52 80 75 (PAN) aye | 38 | 44; 74] 85! 66] 61 61 1,071 
| | | | 
TABLE 27.—Indices and averages, showing the record of the total inbred stock in various 
characteristics during successive 3-month periods, 1916-1919. 
1916 1917 1918 1919 
Character. 
| 1-3 | 46 | 7-9 |10-12) 1-3 | +6 | 7-9 |10-12 1-3 | 4-6 | 7-9 |10-12) 1-3 | 4-6 | 7-9 |10-12 
Per cent born 
alive Dees) ¢x.- 65.6 |74.5 |80.4 |78.3 |67.1 |69.9 |84.1 |83.8 |82.1 |69.9 |80.7 |87.3 |81.9 |84.0 |86.0 [84.0 
Per cent raised of | 
born alive.....- 47.3 |74.6 |78.8 |61.8 |47.6 |73.0 |76.5 |79.3 |68.6 |57.0 |66.0 |94.7 |86.2 |87.3 187.6 |80.0 
Per cent raised... .|32.4 |56.0 |63.0 |49.3 |32.8 |53.8 |63.9 |66.8 [57.0 |40.4 [53.0 [82.7 |70.5 |73.4 |75.8 |67.9 
ee SS SSS | a eS | a SS 
Birth weight | 
(Gotal) sete ae 69.6 |71.0 |68.5 |71.9 |64.5 |65.0 |66.3 |75.3 |69.8 |63.8 |66.0 |81.9 |83.1 |83.1 |79.1 |76.6 
Birth weight i 
(raised) she: 76.3 |77.9 |73.6 |77.6 |72.3 |72.4 |70.9 |78.0 |73.3 |71.1 |73.0 |85.1 |85.2 |85.7 |81.9 |78.3 
Rinks sas ae. 3. 18] 3.32) 3.04] 3.15] 3.19} 3.07] 3.70) 4.11) 3.55} 2.72] 3.22) 5.20) 4.43) 4.43) 3.89) 3.73 
Weight, 33 days. ./181. 3/187. 4/174. 0/181. 4/177. 6)173. 8/192. 9/213. 6/190. 6|160. 8/179. 1/256. 8/231. 5/232. 0/210, 3/201. 3 
Size of litter...... 2.27) 2.21) 2.49} 2.38] 2.15] 2.18) 2.25} 2.27) 2.25] 2.31] 2.28] 2.30} 2.44) 2.50} 2.57) 2.37 
Litters per year..| 3.14| 2.69] 3.35) 3.13) 2.64) 2.96) 3.03) 3.68) 3.39] 2. 84) 3.36] 3.19} 4.03) 3.62) 3.67} 3.27 
Young per year. .| 7.12) 5.94) 8.33] 7.42) 5.68) 6. 43] 6.82) 8.38) 7.62) 6.56] 7.67] 7.35) 9. 84) 9.07) 9. 43) 7.76 
Young raised per | 
ViGale tes. = eee 2.17) 3.18) 4.65) 3.43] 1.94! 3.43) 4.19) 5.42) 4.16} 2.48] 3.87) 6.06] 6.43) 6.25) 6. 23) 5. 06 
Sex ratio-=2--eee: 120. 3/88. 3 |93. 2 |104. 0/105. 0/111. 0/109. 9/90. 0 86 3 i118, 1/116. 5/98. 8 |130. 6/110. 2/102. 2/101. 6 
