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-2-636-1-20242.7%4.6%100 0.52112 0.59114 0.59108 0.53104 0.54109110 0.52104 0.54105 0.50110 0.48109 0.51116 0.44106 0.2792 0.3399 0.14(105) 0.38(102) 0.38(104) 0.36

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 103 109 107 110 105 108 108 106 104 96 103 107 100 96 99 98 100 103 1.6%
DE 1 2 AGT Toleranz Hoher Randen 3 16.05. 01.08. AGT Population DE 2 221 69 2023 101 113 111 110 109 111 111 107 110 109 107 105 103 95 97 103 96 95 3.4%
DE 1 3 Herrenwald 3 25.05. 20.07. AGT Population DE 2 221 70 2023 103 112 110 111 109 111 111 107 110 109 104 106 103 95 97 103 96 95 3.4%
DE 2 10 10 Oby. Unterwieser Wald 3 01.06. 15.08. AGT-Population; Z: Köpke DE 2 632 52 2024 106 117 118 110 113 116 115 113 113 111 112 122 105 95 96 103 99 101 6.5%
DE 2 11 11 Oby. Freisinger Moos 3 15.05. 31.07. AGT-Population; Z: Ott DE 2 227 167 2021 99 113 113 103 98 104 108 98 98 109 106 109 103 96 96 98 99 99 5.4%
DE 2 12 12 Oby. Pfaffenkopf 3 27.05. 01.08. AGT-Population, Z: Stoib DE 2 245 66 2023 104 104 105 107 108 108 106 107 108 108 102 110 103 98 100 102 99 103 1.7%
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 106 103 106 113 109 110 108 111 107 105 99 116 103 100 99 109 104 108 2.5%
DE 2 15 15 Oby. Sonnwendjoch 3 01.06. 20.07. Z: Deller DE 2 254 117 2022 97 106 105 103 103 104 103 104 103 97 101 105 98 96 98 102 109 108 2.9%
DE 2 16 16 Oby. Raggert 3 01.06. 01.08. Z: Moser DE 2 363 207 2023 105 108 108 106 105 108 108 105 104 106 107 108 102 96 101 109 101 102 2.6%
DE 2 18 18 Oby. Sauschütt 3 16.05. 01.08. AGT-Population; Z: Schmidt DE 2 293 46 2022 99 109 110 107 106 107 107 106 105 104 102 106 102 101 99 102 101 102 2.3%
DE 2 19 19 Oby. Wendelstein 3 22.05. 31.07. AGT-Population; Z: Wintersperger DE 2 211 318 2023 108 115 116 112 109 114 115 108 109 113 111 114 103 97 100 97 97 100 3.6%
DE 2 21 21 Nby. Rachel- Diensthütte 3 13.05. 08.08. Z: Angela Tholen † DE 2 736 240 2022 104 109 111 109 105 108 110 104 105 103 101 109 104 100 96 100 100 102 4.2%
DE 2 22 22 Nby Bramandlberg 3 09.05. 25.07. AGT-Population; Z: Solleder DE 2 256 780 2023 101 111 112 109 103 108 110 104 102 101 101 108 102 97 100 100 100 103 4%
DE 2 23 23 Nby Königswald 3 29.04. 15.08. Ca.- Sklenar; Z: Andreas Levcenko DE 2 308 14 2022 103 109 106 106 98 104 107 96 100 108 105 108 102 96 101 107 98 96 2.1%
DE 2 24 24 Nby Schellenberg 3 09.05. 25.07. AGT-Population; Z: Ahrens DE 2 221 74 2023 101 112 110 108 107 109 109 105 109 108 106 106 103 95 97 103 96 95 3.4%
DE 2 33 33 Opf. Am Kühweiher 3 12.05. 10.07. AGT Population; Z: Thein DE 2 752 14 2023 103 113 113 110 105 110 112 104 105 112 107 108 103 96 98 98 96 99 3%
DE 2 41 41 Ofr. Michaelsgraben 3 16.05. 25.07. Z: Merz DE 2 737 11 2023 107 106 107 108 104 108 109 103 106 110 105 112 104 96 97 97 99 99 5.5%
DE 2 43 43 Ofr. Bodenwiese 3 12.05. 14.07. AGT-Population; Z: Schmidt DE 2 293 66 2023 107 118 117 116 109 115 117 109 108 114 109 108 102 97 99 97 103 104 3.6%
DE 2 44 44 Ofr. Hufeisen 3 22.05. 28.07. AGT-Population, Z: Kempter DE 2 298 45 2020 101 105 104 107 101 104 105 100 102 110 100 109 104 98 95 98 102 103 6.4%
DE 2 51 51 Mfr. Tiergarten 3 06.05. 31.07. AGT-Population, Z: LLA Triesdorf DE 2 128 69 2023 109 106 106 105 101 106 108 100 103 108 110 111 101 96 102 96 94 92 2.5%
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 105 117 116 110 113 116 114 112 114 113 103 106 103 96 100 106 92 93 3.4%
DE 2 62 62 Ufr. Gramschatzer Wald 3 20.05. 29.07. AGT-Population; Z: LLH Kirchhain DE 7 45 658 2023 104 114 113 108 108 111 112 107 108 109 105 108 101 94 97 106 102 99 5.4%
DE 2 63 63 Ufr. Haßberge AGT-Toleranzbelegstelle 6 12.05. 14.07. AGT-Population; Z: Bichlmeier DE 2 326 716 2023 105 113 115 114 112 115 114 113 110 109 109 112 103 96 98 108 101 101 4.6%
DE 2 71 71 Schw. Scheppacher Forst AGT-Toleranzbelegstelle 6 15.05. 24.07. AGT-Population, Z: Frey DE 2 294 100 2022 103 109 110 102 103 106 107 101 104 116 116 115 102 95 99 102 100 97 1.3%
DE 2 72 72 Schw. Gunzesried/Ostertal 3 30.05. 25.07. AGT-Population, Z: Fischer DE 2 703 77 2022 98 113 115 100 103 107 108 103 103 106 107 115 103 96 101 98 100 100 0.9%
DE 2 73 73 Schw. Giebelhaus 3 30.05. 25.07. Z: Witt DE 2 172 1 2022 103 112 112 108 102 108 110 101 103 107 111 109 104 100 97 99 95 100 2.8%
DE 2 74 74 Schw. Bleckenau 3 29.05. 17.07. Z: Moser DE 2 363 200 2023 105 108 107 108 103 107 108 104 103 108 105 108 102 95 101 109 101 102 2.6%
DE 2 75 75 Schw. Hochgrat AGT-Toleranzbelegstelle 6 23.05. 01.08. AGT-Population, Z: Wintersperger DE 2 211 318 2023 108 115 116 112 109 114 115 108 109 113 111 114 103 97 100 97 97 100 3.6%
DE 4 3 Waldhof 3 27.05. 01.08. C-4-3 Waldhof DE 4 279 1 2022 101 105 104 99 83 93 103 82 85 108 109 114 101 95 99 105 99 100 1.8%
DE 4 5 Hohenheide 3 20.05. 15.07. C-4-5 Hohenheide DE 4 311 707 2024 111 110 110 112 103 109 113 103 102 111 111 116 105 96 102 95 97 100 2.4%
DE 4 7 Lattbusch 3 22.05. 17.07. 4/7/Lattbusch DE 4 301 163 2023 110 122 123 118 111 119 122 112 110 122 116 108 101 96 102 110 97 99 1.2%
DE 4 8 Schorfheide-Wildfang 3 15.05. 15.08. 90/Varoatoleranz/LIB DE 4 306 51 2023 109 108 111 106 114 113 110 114 113 115 117 110 106 98 103 104 97 102 1.6%
DE 4 10 Rotkäppchen 3 01.06. 01.08. Varoatoleranz/Rotkäppchen/4-10 DE 4 307 124 2024 125 121 121 123 118 126 127 117 118 125 126 120 105 96 103 101 99 103 2.2%
DE 6 1 Spiekeroog 2 02.06. 02.08. Carnica Troiseck Hoffmann (21) DE 6 36 31 2023 106 111 112 115 105 111 113 105 105 104 106 107 103 96 96 106 99 101 5.1%
DE 6 2 Neuwerk 2 18.05. 11.08. Carnica DE 6 1 736 2023 103 101 103 102 102 102 103 99 104 107 108 109 105 96 99 101 100 101 1.5%
DE 6 12 Neuenhof 3 13.06. 16.08. C-T 1075 DE 6 198 42 2023 106 112 112 112 108 112 113 109 107 106 108 113 102 97 99 99 101 103 3.9%
DE 6 14 Gebirgsbelegstelle Torfhaus 3 25.05. 06.07. Carnica -Celle DE 6 1 2786 2022 103 99 100 99 96 98 100 95 98 102 108 105 102 97 99 100 102 103 2.2%
DE 8 1 2 Greifswalder Oie 6 02.06. 17.06. Carnica AGT DE 15 252 1 2023 106 107 107 108 105 108 108 106 104 103 105 111 104 91 100 103 98 98 2.6%
DE 8 3 Dornbusch 2 26.06. 23.07. Carnica DE 6 90 146 2023 103 107 106 112 107 109 108 107 106 108 109 107 104 95 98 105 100 102 4.1%
DE 11 3 Inselbelegstelle Borkum 2 09.05. 18.07. Carnica Sklenar 47/9/26 DE 11 3 60 2022 92 108 106 90 94 97 99 91 97 97 99 101 106 96 99 105 99 98 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 110 106 108 111 108 110 110 108 107 102 102 109 104 98 98 102 96 95 2.1%
DE 13 9 Naturpark Erzgebirge-Vogtland 3 29.05. 10.07. Peschetz DE 2 227 355 2023 107 112 111 113 108 112 113 107 109 113 107 110 103 98 99 97 97 100 3.5%
DE 13 11 Blockstelle 3 09.06. 21.07. Peschetz DE 13 90 672 2022 106 110 115 112 104 110 113 102 105 112 109 114 104 90 101 102 98 95 3.3%
DE 14 1 Kaiserstein 3 30.05. 27.06. DE 6 36 31 2023 106 111 112 115 105 111 113 105 105 104 106 107 103 96 96 106 99 101 5.1%
DE 15 1 Amrum 2 09.06. 21.07. C-Kombi DE 15 69 8 2022 110 107 108 107 107 109 110 104 109 106 101 105 105 96 98 101 98 100 1%
DE 15 3 Hamburger Hallig 2 06.06. 11.07. Carnica Sklenar DE 16 337 232 2023 104 107 107 104 98 103 107 97 100 112 113 114 101 98 98 108 99 99 0.5%
DE 15 4 Helgoland 2 13.05. 31.07. C- Kombi BALKAN DE 15 233 12 2022 108 113 114 110 100 109 113 97 103 107 110 114 103 98 99 100 98 100 1.3%
DE 15 6 List auf Sylt 2 26.05. 20.07. C-Troiseck AT 99 193 62961 2023 105 109 108 106 110 110 108 110 109 105 105 111 103 94 98 105 93 97 4.2%
DE 15 9 Puan Klent / Sylt 2 26.05. 15.08. C- Varroatoleranz DE 6 90 167 2023 104 105 104 111 109 109 107 109 108 108 109 107 104 95 98 105 100 102 4.1%
DE 16 9 Oberhof 3 30.05. 01.08. DE 2 293 66 2023 107 118 117 116 109 115 117 109 108 114 109 108 102 97 99 97 103 104 3.6%
DE 16 11 Kieferle 3 06.06. 25.07. DE 16 310 147 2023 105 109 108 108 105 108 109 103 106 106 103 104 105 92 99 106 98 98 3.3%
DE 17 3 Wangerooge 2 24.05. 29.07. Carnica Selektionslinie LIB (90) DE 6 90 170 2023 104 106 105 111 108 109 108 109 107 108 109 107 104 95 98 105 100 102 4.1%
DE 17 4 Langeoog 2 31.05. 09.08. Carnica-03 (40) DE 17 208 49 2023 100 112 112 110 107 110 110 102 111 104 104 105 102 92 99 111 98 101 2.2%
DE 17 5 AGT Varroatoleranzbelegstelle Norderney (70) 2 24.05. 26.07. Carnica Varroatoleranz (SMR) DE 7 45 658 2023 104 114 113 108 108 111 112 107 108 109 105 108 101 94 97 106 102 99 5.4%
DE 17 6 Juist 2 25.05. 26.07. Carnica Sklenar 47/9/26 (13) DE 14 21 1317 2022 102 111 110 105 98 104 108 97 98 109 111 112 101 96 98 107 100 100 0.5%
DE 19 51 Eisbachtal 3 15.05. 21.07. Carnica AGT DE 19 346 803 2023 107 111 109 106 106 109 110 106 107 111 105 112 102 98 101 98 96 100 2.4%
DE 19 52 Hasental 3 15.05. 17.07. Carnica DE 2 266 231 2023 108 107 108 105 96 103 108 94 97 111 111 114 103 95 99 98 103 98 1.6%
DE 41 1 Sächsische Schweiz 6 31.05. 05.08. Carnica Kirchhain DE 7 45 662 2023 102 111 110 106 107 109 109 106 108 112 106 110 101 94 97 108 104 102 5.4%
AT 99 6 Löhnersbach 3 02.06. 30.07. IT 20 68 1013 2024 102 107 108 102 108 108 106 108 108 108 104 113 102 94 95 100 98 101 4.6%
AT 99 7 Blühnbachtal 3 31.05. 26.07. AT 99 400 745 2023 103 108 110 108 105 108 109 105 106 108 106 113 104 97 97 106 98 101 4.8%
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
AT 99 8 Kristeinertal - Osttirol 3 02.06. 28.07. AT 99 662 21 2023 101 104 106 103 106 106 104 103 108 111 108 109 104 95 98 104 98 100 3.2%
AT 99 13 Pusterwald 3 29.05. 31.07. AT 99 120 87 2023 106 116 115 108 116 117 113 115 117 102 106 117 104 94 96 108 97 103 6.8%
AT 99 16 1 Dürradmer 3 15.05. 04.06. AT 99 364 106 2023 105 113 116 115 109 114 115 109 108 109 109 114 104 96 97 106 100 101 4.5%
AT 99 16 2 Dürradmer 3 09.06. 04.08. AT 99 364 908 2023 103 111 113 111 104 109 112 103 104 102 101 106 103 95 98 103 101 100 4.1%
AT 99 17 1 Gschöder 3 15.05. 04.06. AT 99 364 121 2022 104 111 113 114 106 111 113 106 106 104 102 106 101 95 97 104 105 104 5.1%
AT 99 17 2 Gschöder 3 09.06. 04.08. AT 99 364 705 2023 105 116 115 111 106 112 114 107 104 105 104 110 102 95 97 101 101 102 3.2%
AT 99 21 Abtenau Zinkenbach 3 29.05. 28.07. AT 99 99 1 2023 104 113 116 112 106 112 114 106 107 107 107 113 106 97 96 108 99 101 7.6%
AT 99 27 Geiselgrundalm 3 29.05. 28.07. AT 99 193 62459 2023 104 114 114 105 108 111 111 108 109 105 101 112 105 98 96 106 100 104 5.9%
AT 99 38 Johannsenruhe 3 14.06. 09.08. AT 99 377 92 2023 107 117 117 109 115 117 115 113 116 108 110 116 104 96 97 110 97 105 7.1%
AT 99 40 Kocnatal 3 30.05. 14.08. AT 99 193 63000 2023 107 108 106 105 103 106 108 104 102 106 100 104 103 98 97 107 102 105 3.7%
AT 99 41 Radlgraben 3 01.06. 31.07. AT 99 169 223 2023 101 108 110 104 103 106 107 103 103 108 107 113 106 97 97 102 97 101 5.5%
AT 99 44 Steinberg 3 28.05. 23.07. AT 99 888 331 2023 109 116 116 113 110 115 116 108 111 110 110 112 104 97 96 108 99 103 6.9%
AT 99 45 Gößgraben 3 15.05. 31.07. AT 99 377 501 2023 103 113 111 103 118 115 109 116 119 102 106 116 104 96 97 106 100 104 6.9%
AT 99 46 Mühldorfer Ochsenalm 3 31.05. 15.08. AT 99 117 4 2023 101 108 110 104 112 110 107 112 110 108 107 115 107 96 98 99 104 106 7.9%
AT 99 48 Pöllatal 3 28.05. 31.07. AT 99 663 132 2024 102 106 107 105 107 107 106 105 109 109 106 111 104 96 97 104 98 100 5.4%
AT 99 50 Valentinalm 3 31.05. 15.08. AT 99 120 84 2023 106 118 118 109 115 117 115 114 115 102 106 117 104 95 96 107 99 104 6.8%
AT 99 56 Tratten 3 14.05. 16.07. AT 99 117 38 2023 102 114 114 104 110 111 110 108 110 102 106 114 105 97 97 104 102 107 5.9%
AT 99 58 Mühlviertler Alm 3 21.05. 30.07. AT 99 377 23 2023 105 111 111 113 110 113 112 110 110 104 107 121 104 96 97 101 99 105 4.7%
AT 99 59 Scheiterboden 3 23.05. 15.08. AT 99 671 85 2023 113 117 117 114 113 118 118 112 113 114 113 115 104 97 97 105 100 104 8%
AT 99 98 Seetal 3 25.05. 27.07. AT 99 377 74 2023 107 115 115 108 114 115 113 112 114 109 110 120 105 96 97 105 98 104 7.1%
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 105 104 106 104 100 104 106 99 100 111 109 107 103 98 99 99 98 99 0.9%
CH 51 3 Petit-Mont 3 23.05. 26.07. B20F1/3 CH 51 45 1893 2023 94 98 97 101 97 96 97 97 97 101 101 101 103 96 99 101 99 99 0.5%
CH 51 5 Vermeilley 3 06.06. 01.08. KT02/23 CH 51 152 5652 2022 91 104 104 102 97 98 100 94 99 103 101 97 103 96 99 102 99 99 0.5%
CH 51 6 Moiry 3 13.06. 08.08. B20x30 / 11 CH 51 36 3427 2022 95 104 104 99 97 99 101 96 98 99 99 101 103 96 99 101 99 100 0.7%
CH 51 7 Toules 3 06.06. 01.08. CRP/48 CH 52 707 40 2023 105 104 106 104 100 104 106 99 100 111 109 107 103 98 99 99 98 99 0.9%
CH 51 8 Hongrin 3 30.05. 01.08. KL 14 / 50 CH 51 91 4677 2023 97 102 103 102 102 102 101 101 103 102 101 102 103 96 99 101 99 99 0.5%
CH 51 21 Mont-Dar 3 30.05. 25.07. S91 CH 51 78 9810 2023 97 98 98 101 97 97 98 96 98 104 105 107 103 96 99 101 99 99 0.5%
CH 51 22 SADE 3 16.05. 01.08. GB10 / 22 CH 51 206 903 2024 92 98 99 101 97 96 97 98 96 98 99 100 102 96 98 102 100 100 1.6%
CH 51 51 Grande-Enne 3 14.05. 06.06. 01P / 6 CH 51 10 4636 2023 100 99 99 100 97 98 99 96 99 100 108 107 103 96 99 101 99 100 0.7%
CH 52 5 Greina 3 13.06. 31.07. DE 19 186 21 2022 95 107 105 103 109 106 103 109 108 101 102 104 98 95 98 102 107 108 3.4%
CH 52 7 Justistal 3 26.05. 31.07. DE 1 45 172 2022 99 113 113 107 111 112 110 112 109 101 102 107 96 97 97 100 113 111 5.6%
CH 52 9 Hochgebirgsbelegstelle S-charl 3 13.06. 26.07. DE 16 337 224 2023 105 108 109 107 99 105 109 99 99 111 113 113 102 98 98 108 100 99 0.5%
CH 52 39 Nessleren 3 30.05. 29.07. CH 52 707 36 2022 102 106 108 107 97 103 107 97 98 112 107 105 104 98 98 100 98 100 1.4%
IT 4 1 Val Genova (TN) 3 06.06. 31.07. Kirchhain IT 20 106 84 2022 98 104 105 101 104 104 102 105 104 109 103 107 104 96 99 100 99 101 2.1%
IT 20 3 Pederü 3 27.05. 13.06. IT 20 108 9044 2023 111 111 111 111 112 114 113 110 113 110 111 120 105 98 99 99 100 101 4.1%
NL 55 2 Vlieland 2 06.06. 05.07. NL 55 55 41 2023 102 113 113 107 101 108 111 101 101 103 104 105 103 94 99 103 99 99 3.6%

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 4.60 %.

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