AGB 211: Livestock and Poultry Breeding (2+1)

DAIRY SEARCH INDEX / SUNDARESAN INDEX 

• Under Indian conditions, evaluation of bulls is made with information from a very few daughters and from records subjected to serious environmental differences. Sundaresan (1965) gave two methods one for sire evaluation at farm level and another for key-village.

The farm method takes dam-daughter records in to consideration.

S_I = µ + n / (n + 12) (D – C_D) – b (M – C_M)

For key-village level the dam’s record is not available so, he modified the formula as

S_I = µ + n / (n + 12) (D – C_D)

where,

µ = herd average; n = number of daughters per sire;

D = average of daughters; C_D = average of contemporaries of daughters;

b = intra-sire regression of daughters on dam; M = average of dams;

C_M = average of contemporaries of dams