50 BULLETIN 1121, U. S. DEPARTMENT OF AGRICULTURE. 
TABLE 14.—Data on the fertility in the various inbreeding and crossbreeding experiments, 
1916-1919. 
3 s ] 
Size of litter. | eee Aver. | Aver: | Aver- oe 
aaa | Num- | Num- ua age age ee 
Experiment. | mating | Per of | ber of aed of | litters | young rete . 
POU EOP Ig.) QO aB Ne 6 ties 8) litters. | young. | > per per 
| years. litter. ae ae per 
| Leyak el year. 
| 
AG oS ae ee ee D 87 |187 |133 | 32} 2 |....|.... ji) 119.3 441 998 2. 26 3. 70 8.37 5. 00 
ile ERNE ee 45 115 | 85 | 83) 12/ 3)....| 90.7 293 740 2. 53 3. 23 8.16 4.30 
BAN SAE ae 93 603) SIGs tsi) ESel: | 67.8 223 488 2.19 3. 29 7.20 3.91 
5 REEL ED 64 |120 |108 | 40 | 9 |... | 94.9 341 833 | 2.44 3. 59 8.78 5.11 
SOLOS LIES. 39 | 53 | 51) 17| 2] 1 56. 3 163 382 2. 34 2. 90 6.79 3.39 
Othersacs2-2 5 119 |210 {140 | 44 | 7 Dare Aloe 520 | 1,170 2. 25 2. 67 6. 01 2. 80 
Inbred s.-- os 414 |766 |580 184 | 33 | 4 | 623.5 | 1,981 | 4,611 2. 33 3.18 7.40 3. 96 
OREURERE. os 34 |235 |157 | 51 | 11 oa 2s MATS3E2 588 | 1,334 2.27 3.21 7. 28 4, 48 
CR see ee ee SHE aye eter MAS ies ageal. . athe: 164 410 2. 50 4.16 | 10.41 7.99 
AGL? Beek! 19 | 41 | 57); 44/15] 8]....) 482) 184 571 3.10 3.82 | 11.85 9. 02 
COxs ee eee 42 | 69 | 82) 35 | 9), 1 ]..--) 54.3.) | 238 617 2. 59 4,38 | 11.36 7.61 
Ge ap les 50 | 77 | 735)'39 | oRO ok IMA. 4) 4) 7249 629 2.53 4.34 | 10.96 7.46 
C2i ie Teiea aa Pe Wade LOA EO sQ oman ah alir.Gal 75 182 2. 43 4.26 | 10.34 7.10 
OA Pie men es 21 | 40 | 44 | 22| 61 5 33. 8 138 381 | 2.76 4.08 | 11.27 8.31 
CG_USe ee s.)--. 32 | 64 | 56 | 41/13 | 4 ]....) 47.4 210 | 581 2 4.43 | 12.26 8. 16 
BEI 81 |188 |212 | 78 | 21| 7] 1) 159.6 588 | 1,559 | 2.65 3. 68 Saris 6. 71 
TABLE 15.—Percentage born alive. 
{ Average in litters of each size, the combined average, and the index (litters of 1, 2, 3, and 4 weighted 1, 3, 3, 
and 1, respectively). Inbreeding and crossbreeding experiments, 1916-1919.] 
Size of litter. 
Experiment. Sa ee ee ee) eles 
1 2 3 4 5 6 7 
oA Nc mar Urns halle Rielle nae 69.0} 78.9 77.4 GTI 2 EO ANA ee Gee ee 75.5 75.6 
Lee ei ee or: ae 82.2 81.7 77.6 | 65.2 48.3 0:0) ioe ees 72.7 78.2 
SS DO eras OK ns Padi ante a S657 SOI 76.2 61.1 OO oe ee 79.1 80.8 
Sheet ates, PER ene ae 70.3 89.6 78.7 63.1 AOD hc SS chs 76.2 79.8 
aca Logie RA adae ot gineherieae 87.2"\ (85-8 St.0 | 60:3 9050 PLO Oe eons 81.0 
Other 1) eet ewes o 82. Awl 280.2 75.5 Goer Mie acy Lee Ee aes bah 73.2 75.4 
Tnbred- ewe am. be Aca 78.7 | © 83.0 77.4 GLAM AS Olle DFO Nee ae 75.3 Wet 
Comes Oe AO SES TORE Ue 85.1 S71 75.6 63.2 BOLT A ceo eet en eae ra ay) 79.5 
CMe em ht ee 87.1 86.8 RG. 2 se AO: Al PED: Abd pe ge wee ape Set ee 83.9 85.8 
ACR ead INF NER a AKER 73.7 92°71 “91-2 90.3 CPA al ae AL Nin aia alba 88. 4 89.5 
PEL GIN get oe eee EO eee nN at 85.7 86.2 SG 7G eal 50: Ould ees 84.1 86.3 
CEES RAE aed, TAR 90.0} 93.5 84:9)" 80/8 RO eee eee 85.2 88.2 
LO ae ORME cathe ts OS omen 92.3 90.3 78.9 SFO le cOOs teens ie aeae es 85.7 85.6 
CEA PERE EK 95.2 96.2| 92.4 69.3 73.3 Bogie ON Wedel a 84.3 91.3 
OL Ge SE CES ae en aa ae 84.4 89.8 89.3 73.8 COLO LAG 2AS alee eee 80. 4 86.9 
BE CE Sips ee comin ak Wad 84.0] 91.0 85.4} 81.1 SE0c) bet 0.0} 84.2 86.8 
