Íslenskar landbúnaðarrannsóknir - 01.03.1970, Qupperneq 81

Íslenskar landbúnaðarrannsóknir - 01.03.1970, Qupperneq 81
COLOUR INHERITANCE IN ICELANDIC SHEEP 79 TABLE 39. Continued B. Matings involving only genotype A\A\, A\A$ and dgdg Type of birth Lamb group Mating wm nm wf nf Total DF X2 AiAi x AiA5 S 76 75 151 1 0.007 T 125 137 262 1 0.550 S + T 201 212 413 1 0.293 AiAi X A5A5 S 42 32 74 1 1.351 T 80 60 140 1 2.857 S + T 122 92 214 1 4.206* AiAg x A1A5 S 55 17 40 22 134 3 4.245 T 95 18 96 37 246 3 6.791 S + T 150 35 136 59 380 3 6.765 A1A5 X AgAg S 9 9 17 22 57 3 8.614* T 32 22 38 22 114 3 6.561 S + T 41 31 55 44 171 3 6.848 AgAg X AiAg S 7 9 7 11 34 3 1.294 T 10 18 18 24 70 3 5.657 S + T 17 27 25 35 104 3 6.308 AgAg X A5A5 S 43 44 87 1 0.012 T 65 57 122 1 0.525 S + T 108 101 209 1 0.234 Total number of progeny 1491 then only be found among white ewes. Table 41 sliows the x2’s from table 39 B classified according to white and nonwhite ewes for singles and twins separately ancl for singles and twins combined. Table 41 shows that relatively more of the variation can be attributed to non- wliite ewes. The sum for singles and twins among white ewes gives x2i4 = ^8.544 (0.20 > P > 0.10) while for nonwliite ewes one obtains x2io = 19-920 (P < 0.05). This excludes embryonic mortality among white ewes as the only underlying source of varia- tion in table 39 B, and one is inclined to believe that selective fertilization might play a part in the process. G. SELECTIVE FERTILIZATION AND EMBRYONIC MORTALITY Several attempts have been made to de- velop a model which would explain the variation in segregation ratios in table 39 B in terms of selective fertilization and em- bryonic mortality. The model that gave the best fit to the
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