Language:

country
Association
Breeder n°
Password

Backto selection form

Breed planning for mating stations 2026

Breeding values of the selected mother queen

code of queen 2aInbreeding
Queen
Inbreeding
Worker
Honey
yield
Defensive
behavior
Calmness
during
inspection
Swarming
drive
Varroa-
index
TBVPerformance
ndex
hygienic
behaviour
Varroa
growth
Colony
strength
spring
development
over-
wintering
Chalk-
brood
CBPNosemosisSMRRecappingRecapping
infested cells
DE-11-1-10764-20204.6%6.8%104 0.5697 0.6395 0.63106 0.56118 0.58110101 0.56122 0.58113 0.53(87) 0.44(89) 0.46(102) 0.41101 0.27108 0.3699 0.13(96) 0.36(108) 0.37(111) 0.33

Breeding values and inbreeding coefficients of potential descendants

mating station codedetails of mating stationMate (4A)Breeding values
C ASSOC No. D Code Surname TM from to Breeding line C4A A4A B4A No4A Y4A Code Honey
yield
Defensive
behavior
Calmness
during
inspection
Swarming
drive
Varroa-
index
Total
breeding
value
Performance
ndex
hygienic
behaviour
Varroa
growth
Colony
strength
spring
development
over-
wintering
Chalk-
brood
CBP Nosemosis SMR Recapping Recapping
infested cells
INZW
Weighting in %
1515151540--
DE 1 1 Hornisgrinde 3 25.05. 20.07. AGT-Population DE 1 7 57 2023 105 101 98 109 112 108 104 115 108 84 93 100 97 104 99 94 102 107 4.1%
DE 1 2 AGT Toleranz Hoher Randen 3 16.05. 01.08. AGT Population DE 2 221 69 2023 103 106 102 109 116 112 106 116 114 97 97 98 100 103 97 99 99 99 3.1%
DE 1 3 Herrenwald 3 25.05. 20.07. AGT Population DE 2 221 70 2023 105 105 101 110 115 112 106 116 114 97 94 99 100 103 97 99 99 99 3.1%
DE 2 10 10 Oby. Unterwieser Wald 3 01.06. 15.08. AGT-Population; Z: Köpke DE 2 632 52 2024 108 109 108 109 120 117 110 122 117 100 102 115 102 103 96 99 102 105 3.3%
DE 2 11 11 Oby. Freisinger Moos 3 15.05. 31.07. AGT-Population; Z: Ott DE 2 227 167 2021 101 105 104 102 105 104 103 107 102 98 95 101 100 104 96 94 102 103 2.1%
DE 2 12 12 Oby. Pfaffenkopf 3 27.05. 01.08. AGT-Population, Z: Stoib DE 2 245 66 2023 105 96 96 107 115 108 101 116 112 97 92 103 100 106 100 97 102 107 2.4%
DE 2 13 13 Oby. An den 3 Wassern AGT-Toleranzbelegstelle 6 30.05. 01.08. AGT-Population; Z: FZ Mayen DE 11 1 1330 2022 108 95 96 112 116 110 103 120 111 93 89 109 100 108 99 105 107 112 12.1%
DE 2 15 15 Oby. Sonnwendjoch 3 01.06. 20.07. Z: Deller DE 2 254 117 2022 99 99 96 102 110 104 98 113 107 86 91 98 95 104 98 97 112 112 1.9%
DE 2 16 16 Oby. Raggert 3 01.06. 01.08. Z: Moser DE 2 363 207 2023 107 100 98 106 112 108 103 115 109 95 97 101 99 104 101 104 104 106 1.6%
DE 2 18 18 Oby. Sauschütt 3 16.05. 01.08. AGT-Population; Z: Schmidt DE 2 293 46 2022 101 101 101 106 113 108 103 115 109 93 92 99 99 109 99 97 104 106 4.7%
DE 2 19 19 Oby. Wendelstein 3 22.05. 31.07. AGT-Population; Z: Wintersperger DE 2 211 318 2023 110 108 106 111 115 114 110 117 113 102 101 107 100 105 100 93 100 104 3.3%
DE 2 21 21 Nby. Rachel- Diensthütte 3 13.05. 08.08. Z: Angela Tholen † DE 2 736 240 2022 106 101 101 108 112 109 105 113 109 92 91 102 101 108 96 95 103 106 4.8%
DE 2 22 22 Nby Bramandlberg 3 09.05. 25.07. AGT-Population; Z: Solleder DE 2 256 780 2023 103 104 102 108 110 108 105 113 106 89 91 101 99 105 100 95 103 107 4.7%
DE 2 23 23 Nby Königswald 3 29.04. 15.08. Ca.- Sklenar; Z: Andreas Levcenko DE 2 308 14 2022 105 101 97 106 105 104 103 105 105 96 94 101 100 104 101 103 101 100 2%
DE 2 24 24 Nby Schellenberg 3 09.05. 25.07. AGT-Population; Z: Ahrens DE 2 221 74 2023 103 105 100 107 114 110 104 114 113 97 95 99 100 103 97 99 99 99 3.1%
DE 2 33 33 Opf. Am Kühweiher 3 12.05. 10.07. AGT Population; Z: Thein DE 2 752 14 2023 105 106 104 109 112 110 107 113 109 100 97 101 100 104 98 93 99 103 2.5%
DE 2 41 41 Ofr. Michaelsgraben 3 16.05. 25.07. Z: Merz DE 2 737 11 2023 109 98 98 108 111 108 104 112 110 99 95 105 101 104 97 93 102 103 2.1%
DE 2 43 43 Ofr. Bodenwiese 3 12.05. 14.07. AGT-Population; Z: Schmidt DE 2 293 66 2023 109 110 108 115 116 116 112 118 113 102 99 101 99 105 99 92 106 108 2.9%
DE 2 44 44 Ofr. Hufeisen 3 22.05. 28.07. AGT-Population, Z: Kempter DE 2 298 45 2020 103 98 94 106 108 104 100 109 107 99 90 102 101 106 95 93 105 107 3.1%
DE 2 51 51 Mfr. Tiergarten 3 06.05. 31.07. AGT-Population, Z: LLA Triesdorf DE 2 128 69 2023 111 98 97 104 108 106 103 109 107 96 100 104 98 104 102 91 97 96 1.8%
C ASSOC No. D Code Surname TM from to Breeding line C4A A4A B4A No4A Y4A Code Honey
yield
Defensive
behavior
Calmness
during
inspection
Swarming
drive
Varroa-
index
Total
breeding
value
Performance
ndex
hygienic
behaviour
Varroa
growth
Colony
strength
spring
development
over-
wintering
Chalk-
brood
CBP Nosemosis SMR Recapping Recapping
infested cells
INZW
DE 2 61 61 Ufr. Spessart 3 19.05. 28.07. AGT-Population; Z: Ahrens DE 2 221 102 2022 107 110 106 109 120 116 109 121 118 101 93 99 101 104 100 101 95 97 3.7%
DE 2 62 62 Ufr. Gramschatzer Wald 3 20.05. 29.07. AGT-Population; Z: LLH Kirchhain DE 7 45 658 2023 106 107 103 107 115 112 107 117 112 98 95 101 98 102 97 102 104 103 3.3%
DE 2 63 63 Ufr. Haßberge AGT-Toleranzbelegstelle 6 12.05. 14.07. AGT-Population; Z: Bichlmeier DE 2 326 716 2023 107 105 106 113 119 115 109 122 115 97 99 105 101 103 98 104 104 105 2.6%
DE 2 71 71 Schw. Scheppacher Forst AGT-Toleranzbelegstelle 6 15.05. 24.07. AGT-Population, Z: Frey DE 2 294 100 2022 105 101 101 101 110 106 102 110 109 104 106 108 100 103 99 98 103 101 1.3%
DE 2 72 72 Schw. Gunzesried/Ostertal 3 30.05. 25.07. AGT-Population, Z: Fischer DE 2 703 77 2022 100 106 106 99 110 107 103 112 108 94 97 108 100 104 101 93 103 104 1.5%
DE 2 73 73 Schw. Giebelhaus 3 30.05. 25.07. Z: Witt DE 2 172 1 2022 105 104 103 107 109 108 106 110 107 96 101 102 101 108 97 95 98 104 4.6%
DE 2 74 74 Schw. Bleckenau 3 29.05. 17.07. Z: Moser DE 2 363 200 2023 107 100 97 107 110 107 103 113 107 97 95 101 99 103 101 104 104 106 1.6%
DE 2 75 75 Schw. Hochgrat AGT-Toleranzbelegstelle 6 23.05. 01.08. AGT-Population, Z: Wintersperger DE 2 211 318 2023 110 108 106 111 115 114 110 117 113 102 101 107 100 105 100 93 100 104 3.3%
DE 4 3 Waldhof 3 27.05. 01.08. C-4-3 Waldhof DE 4 279 1 2022 103 97 95 99 90 94 98 91 89 96 99 107 98 103 100 100 102 104 1%
DE 4 5 Hohenheide 3 20.05. 15.07. C-4-5 Hohenheide DE 4 311 707 2024 113 102 100 111 110 110 108 112 107 100 101 108 103 103 102 91 100 104 1.7%
DE 4 7 Lattbusch 3 22.05. 17.07. 4/7/Lattbusch DE 4 301 163 2023 112 115 114 117 118 120 117 121 114 110 106 101 99 104 102 105 100 103 0.5%
DE 4 8 Schorfheide-Wildfang 3 15.05. 15.08. 90/Varoatoleranz/LIB DE 4 306 51 2023 111 100 101 105 121 114 105 123 118 104 107 103 103 106 103 100 100 106 0.8%
DE 4 10 Rotkäppchen 3 01.06. 01.08. Varoatoleranz/Rotkäppchen/4-10 DE 4 307 124 2024 127 113 112 122 125 127 122 126 123 114 116 113 103 104 103 96 102 107 1.8%
DE 6 1 Spiekeroog 2 02.06. 02.08. Carnica Troiseck Hoffmann (21) DE 6 36 31 2023 108 104 102 114 112 111 108 114 110 93 96 100 100 104 96 101 102 105 4.9%
DE 6 2 Neuwerk 2 18.05. 11.08. Carnica DE 6 1 736 2023 105 94 93 101 109 103 98 109 108 96 98 102 102 104 99 96 103 105 2.2%
DE 6 12 Neuenhof 3 13.06. 16.08. C-T 1075 DE 6 198 42 2023 108 104 103 112 115 113 108 119 111 95 98 106 99 105 99 95 103 107 4.6%
DE 6 14 Gebirgsbelegstelle Torfhaus 3 25.05. 06.07. Carnica -Celle DE 6 1 2786 2022 105 91 90 98 103 99 95 104 103 91 98 97 99 105 99 95 105 107 3.8%
DE 8 1 2 Greifswalder Oie 6 02.06. 17.06. Carnica AGT DE 15 252 1 2023 108 99 97 107 112 108 103 115 109 92 95 104 102 99 100 98 101 102 1.6%
DE 8 3 Dornbusch 2 26.06. 23.07. Carnica DE 6 90 146 2023 105 100 96 111 114 109 103 117 110 97 99 99 102 103 98 101 103 106 3.4%
DE 11 3 Inselbelegstelle Borkum 2 09.05. 18.07. Carnica Sklenar 47/9/26 DE 11 3 60 2022 94 101 97 89 101 97 94 101 102 85 89 94 103 104 99 101 102 102 0%
C ASSOC No. D Code Surname TM from to Breeding line C4A A4A B4A No4A Y4A Code Honey
yield
Defensive
behavior
Calmness
during
inspection
Swarming
drive
Varroa-
index
Total
breeding
value
Performance
ndex
hygienic
behaviour
Varroa
growth
Colony
strength
spring
development
over-
wintering
Chalk-
brood
CBP Nosemosis SMR Recapping Recapping
infested cells
INZW
DE 11 11 Erbeskopf AGT-Toleranzbelegstelle 3 26.05. 21.07. AGT-Population DE 11 171 309 2023 112 98 98 110 115 111 105 117 112 90 92 101 101 106 98 97 99 99 9.6%
DE 13 9 Naturpark Erzgebirge-Vogtland 3 29.05. 10.07. Peschetz DE 2 227 355 2023 109 105 102 112 115 113 108 116 113 102 97 103 100 106 99 92 100 104 3.3%
DE 13 11 Blockstelle 3 09.06. 21.07. Peschetz DE 13 90 672 2022 108 103 105 111 110 110 108 111 109 101 99 107 101 98 102 98 101 99 1.4%
DE 14 1 Kaiserstein 3 30.05. 27.06. DE 6 36 31 2023 108 104 102 114 112 111 108 114 110 93 96 100 100 104 96 101 102 105 4.9%
DE 15 1 Amrum 2 09.06. 21.07. C-Kombi DE 15 69 8 2022 112 100 99 106 114 110 105 113 113 95 91 97 102 104 98 96 101 104 1.5%
DE 15 3 Hamburger Hallig 2 06.06. 11.07. Carnica Sklenar DE 16 337 232 2023 106 100 98 104 105 104 102 106 104 101 103 106 99 106 98 103 102 103 0.5%
DE 15 4 Helgoland 2 13.05. 31.07. C- Kombi BALKAN DE 15 233 12 2022 110 105 104 109 107 109 109 106 107 95 100 106 101 105 100 95 101 103 2.9%
DE 15 6 List auf Sylt 2 26.05. 20.07. C-Troiseck AT 99 193 62961 2023 107 101 99 105 117 111 104 119 113 94 95 104 100 102 98 100 96 101 3.1%
DE 15 9 Puan Klent / Sylt 2 26.05. 15.08. C- Varroatoleranz DE 6 90 167 2023 106 97 94 110 116 109 102 118 112 97 99 99 102 103 98 101 103 106 3.4%
DE 16 9 Oberhof 3 30.05. 01.08. DE 2 293 66 2023 109 110 108 115 116 116 112 118 113 102 99 101 99 105 99 92 106 108 2.9%
DE 16 11 Kieferle 3 06.06. 25.07. DE 16 310 147 2023 107 101 99 107 112 108 104 112 111 95 93 97 102 100 99 101 101 102 1.8%
DE 17 3 Wangerooge 2 24.05. 29.07. Carnica Selektionslinie LIB (90) DE 6 90 170 2023 106 98 96 110 115 110 103 118 112 97 99 99 102 103 98 101 103 106 3.4%
DE 17 4 Langeoog 2 31.05. 09.08. Carnica-03 (40) DE 17 208 49 2023 102 105 103 109 114 110 105 112 115 93 94 98 99 100 99 107 101 105 1.7%
DE 17 5 AGT Varroatoleranzbelegstelle Norderney (70) 2 24.05. 26.07. Carnica Varroatoleranz (SMR) DE 7 45 658 2023 106 107 103 107 115 112 107 117 112 98 95 101 98 102 97 102 104 103 3.3%
DE 17 6 Juist 2 25.05. 26.07. Carnica Sklenar 47/9/26 (13) DE 14 21 1317 2022 104 103 101 105 105 105 104 107 103 98 101 105 98 104 98 102 103 104 0.6%
DE 19 51 Eisbachtal 3 15.05. 21.07. Carnica AGT DE 19 346 803 2023 109 103 100 105 113 110 105 115 111 100 95 105 100 105 101 93 99 104 2.8%
DE 19 52 Hasental 3 15.05. 17.07. Carnica DE 2 266 231 2023 110 99 98 104 103 104 103 104 101 100 100 107 101 103 99 93 106 102 0.5%
DE 41 1 Sächsische Schweiz 6 31.05. 05.08. Carnica Kirchhain DE 7 45 662 2023 104 104 100 105 114 110 104 115 112 100 96 102 98 102 97 104 107 106 3.3%
AT 99 6 Löhnersbach 3 02.06. 30.07. IT 20 68 1013 2024 104 100 99 101 115 108 101 117 112 97 94 105 100 102 95 96 101 105 4.6%
AT 99 7 Blühnbachtal 3 31.05. 26.07. AT 99 400 745 2023 105 101 100 107 112 109 104 114 110 96 96 106 101 105 97 102 101 105 3.9%
C ASSOC No. D Code Surname TM from to Breeding line C4A A4A B4A No4A Y4A Code Honey
yield
Defensive
behavior
Calmness
during
inspection
Swarming
drive
Varroa-
index
Total
breeding
value
Performance
ndex
hygienic
behaviour
Varroa
growth
Colony
strength
spring
development
over-
wintering
Chalk-
brood
CBP Nosemosis SMR Recapping Recapping
infested cells
INZW
AT 99 8 Kristeinertal - Osttirol 3 02.06. 28.07. AT 99 662 21 2023 103 97 96 102 113 106 100 113 112 100 97 102 102 103 98 100 101 104 2.2%
AT 99 13 Pusterwald 3 29.05. 31.07. AT 99 120 87 2023 108 108 106 107 123 117 109 124 121 91 96 110 102 102 96 103 100 106 4%
AT 99 16 1 Dürradmer 3 15.05. 04.06. AT 99 364 106 2023 107 106 107 114 116 114 110 118 112 98 99 106 101 104 97 101 103 105 2.7%
AT 99 16 2 Dürradmer 3 09.06. 04.08. AT 99 364 908 2023 105 103 104 110 111 110 107 113 108 91 90 99 100 103 98 99 104 104 2.5%
AT 99 17 1 Gschöder 3 15.05. 04.06. AT 99 364 121 2022 106 103 103 114 113 112 108 115 110 93 92 98 99 103 97 100 108 108 3.1%
AT 99 17 2 Gschöder 3 09.06. 04.08. AT 99 364 705 2023 107 108 106 110 113 112 109 116 109 94 94 102 99 103 97 96 104 106 3.3%
AT 99 21 Abtenau Zinkenbach 3 29.05. 28.07. AT 99 99 1 2023 106 105 107 111 113 112 109 115 111 95 97 106 104 105 96 103 102 105 3.3%
AT 99 27 Geiselgrundalm 3 29.05. 28.07. AT 99 193 62459 2023 106 106 104 104 115 112 106 117 113 94 90 105 102 106 96 101 103 108 3.5%
AT 99 38 Johannsenruhe 3 14.06. 09.08. AT 99 377 92 2023 109 109 108 108 122 117 110 122 121 97 100 109 102 104 97 105 100 109 4.1%
AT 99 40 Kocnatal 3 30.05. 14.08. AT 99 193 63000 2023 109 100 97 104 110 107 103 113 106 94 90 97 100 106 97 102 105 109 3.3%
AT 99 41 Radlgraben 3 01.06. 31.07. AT 99 169 223 2023 103 100 100 103 110 107 102 113 107 97 97 106 103 105 97 97 100 105 4.3%
AT 99 44 Steinberg 3 28.05. 23.07. AT 99 888 331 2023 111 108 106 112 116 115 111 117 115 99 100 105 101 105 97 104 102 107 3.7%
AT 99 45 Gößgraben 3 15.05. 31.07. AT 99 377 501 2023 105 105 102 102 125 115 104 125 123 91 96 108 102 104 97 101 102 107 4%
AT 99 46 Mühldorfer Ochsenalm 3 31.05. 15.08. AT 99 117 4 2023 103 101 100 103 119 111 102 121 115 96 97 108 104 104 98 94 106 110 4.9%
AT 99 48 Pöllatal 3 28.05. 31.07. AT 99 663 132 2024 104 98 98 105 114 108 101 114 113 98 96 103 101 104 97 100 101 104 3.1%
AT 99 50 Valentinalm 3 31.05. 15.08. AT 99 120 84 2023 108 110 109 108 122 118 111 123 120 91 96 110 102 103 96 103 102 108 4%
AT 99 56 Tratten 3 14.05. 16.07. AT 99 117 38 2023 104 107 104 104 117 112 105 118 115 90 96 107 102 105 97 99 105 111 4.7%
AT 99 58 Mühlviertler Alm 3 21.05. 30.07. AT 99 377 23 2023 107 103 102 112 117 113 107 119 114 93 97 114 101 104 97 96 102 109 6.1%
AT 99 59 Scheiterboden 3 23.05. 15.08. AT 99 671 85 2023 115 109 108 113 120 119 113 121 118 102 103 107 101 105 97 100 103 108 3.9%
AT 99 98 Seetal 3 25.05. 27.07. AT 99 377 74 2023 109 107 105 107 121 116 109 122 118 97 100 112 102 104 97 100 101 108 4.7%
C ASSOC No. D Code Surname TM from to Breeding line C4A A4A B4A No4A Y4A Code Honey
yield
Defensive
behavior
Calmness
during
inspection
Swarming
drive
Varroa-
index
Total
breeding
value
Performance
ndex
hygienic
behaviour
Varroa
growth
Colony
strength
spring
development
over-
wintering
Chalk-
brood
CBP Nosemosis SMR Recapping Recapping
infested cells
INZW
CH 51 1 Bonatchiesse 3 13.06. 01.08. CRP/48 CH 52 707 40 2023 107 97 97 104 107 104 101 108 105 100 99 100 100 106 99 95 101 103 1.1%
CH 51 3 Petit-Mont 3 23.05. 26.07. B20F1/3 CH 51 45 1893 2023 96 91 88 100 104 97 92 106 101 90 90 94 100 104 99 97 102 103 0.9%
CH 51 5 Vermeilley 3 06.06. 01.08. KT02/23 CH 51 152 5652 2022 93 96 94 101 103 99 95 103 103 91 91 90 100 104 99 97 102 103 0.8%
CH 51 6 Moiry 3 13.06. 08.08. B20x30 / 11 CH 51 36 3427 2022 97 96 94 99 104 99 96 105 102 88 89 94 100 104 99 97 102 104 1.3%
CH 51 7 Toules 3 06.06. 01.08. CRP/48 CH 52 707 40 2023 107 97 97 104 107 104 101 108 105 100 99 100 100 106 99 95 101 103 1.1%
CH 51 8 Hongrin 3 30.05. 01.08. KL 14 / 50 CH 51 91 4677 2023 99 95 94 101 109 102 97 110 107 91 91 94 100 104 99 97 102 103 0.9%
CH 51 21 Mont-Dar 3 30.05. 25.07. S91 CH 51 78 9810 2023 98 90 88 100 104 98 93 105 103 92 94 99 101 104 99 97 102 103 0.9%
CH 51 22 SADE 3 16.05. 01.08. GB10 / 22 CH 51 206 903 2024 94 90 89 100 104 97 92 107 101 87 89 93 100 103 98 98 102 104 0.9%
CH 51 51 Grande-Enne 3 14.05. 06.06. 01P / 6 CH 51 10 4636 2023 102 92 89 99 104 99 94 105 103 89 98 100 100 104 99 96 102 104 1.3%
CH 52 5 Greina 3 13.06. 31.07. DE 19 186 21 2022 97 99 96 102 116 107 98 118 113 89 91 97 95 103 98 97 110 112 2.1%
CH 52 7 Justistal 3 26.05. 31.07. DE 1 45 172 2022 101 106 103 106 118 112 105 121 113 89 92 99 93 105 97 96 116 115 2.5%
CH 52 9 Hochgebirgsbelegstelle S-charl 3 13.06. 26.07. DE 16 337 224 2023 107 101 99 107 106 105 104 108 103 100 103 106 99 106 98 103 102 103 0.5%
CH 52 39 Nessleren 3 30.05. 29.07. CH 52 707 36 2022 104 99 99 107 104 104 102 106 102 101 97 97 101 106 98 95 101 104 1.4%
IT 4 1 Val Genova (TN) 3 06.06. 31.07. Kirchhain IT 20 106 84 2022 100 96 96 100 111 104 98 114 108 97 93 100 101 104 99 95 102 105 3%
IT 20 3 Pederü 3 27.05. 13.06. IT 20 108 9044 2023 113 103 101 110 119 115 108 119 117 98 101 113 102 106 100 95 103 105 3.7%
NL 55 2 Vlieland 2 06.06. 05.07. NL 55 55 41 2023 104 106 103 107 108 108 106 110 106 91 94 98 100 102 99 99 101 102 3.3%

Notice

The inbreeding coefficient refers to the workers of the planned colony. The inbreeding coefficient of the queen only depends on the mother colony and is 6.78 %.

Click on queen code shows pedigree, breeding values and inbreeding coefficients.

The total breeding values is calculated using the given weighting factors.

Only island and line mating stations with a registered 4a, subjected to breeding values estimation are displayed. For a full list of mating stations, see Allocation of mating stations.

The breeding record data is the responsibility of the state associations !

Use of genetic evaluation data for publications or commercial purposes is subject to permission by the Institute for Bee Research Hohen Neuendorf, Germany, Länderinstitut für Bienenkunde Hohen Neuendorf e.V.

The performance index is composed of the breeding value for honey yield, gentleness, calmness and swarming tendency in equal proportions.

For suggestions and comments use our contact form, please.

Legend

TM
Type of mating station
1 - Insemination station with fixed 4a
2 - Island mating station
3 - line mating station
4 - race mating station
6 - tolerance mating station
TBV
Total breeding value
INZW
Inbreeding coefficient of planned offspring