Page 14 - Puke-Nui Angus Catalogue eBook.pdf

HDT Index (heifer/dairy terminal) NB. It is important point to be aware that while no emphasis has been
placed on some traits, for example maternal traits in the HDT, they still
• Progeny will be prime at heavy carcase weights where the improved New Zealand Angus Heifer/Dairy Terminal Index - Predicted Response may be selected for indirectly through positive or negative correlations
AngusPure Index (API) marbling and subsequent eating quality traits can be expressed. with other traits, as is the case with Days to Calving in the HDT.
New Zealand Angus AngusPure Index - Predicted Response
These characteristics are ideal for an environment where the cow herd can Expected Change in Individual Traits
be managed with extra feed if seasonal feed deficits occur.
Expected Change in Individual Traits Comparison of SRI and API

SRI is a maternal trait emphasised index.
API is also a maternal driven index with added carcase trait emphasis.
API selected animals can produce more net profit per animal through extra CEd CEm GL BW 200W 400W 600W MCW Milk SS DC Cwt EMA Rib Rump RBY IMF
CEd CEm GL BW 200W 400W 600W MCW Milk SS DC Cwt EMA Rib Rump RBY IMF performance when feed is abundant. Finished progeny can be taken to Above the 0 line (X axis) selects for more positive numbers and below the line selects
for more negative numbers. For some traits (e.g. growth), a positive response is
heavier weights with increased likelihood of achieving marbling premiums. desirable and for others (e.g. days to calving), a negative response is desirable.
Above the 0 line (X axis) selects for more positive numbers and below the line selects SRI selected animals can produce more net profit per animal through extra
for more negative numbers. For some traits (e.g. growth), a positive response is This index is primarily driven by getting live calves on the ground,
desirable and for others (e.g. days to calving), a negative response is desirable. performance in environments where the cow herd is likely to be challenged and producing an early maturing prime animal with added carcase traits
by regular seasonal feed deficits, maintaining body condition is critical to for improved carcase yield and marbling with no direct selection for
Genetic Selection of bulls using only the API tool will on average over longevity and feeding out is not a viable option. maternal traits.
time develop a cow herd with the following:
HDT Index (heifer/dairy terminal) NB. It is important point to be aware that while no emphasis has been
• Improved weaning rate through increased fertility and easier calving placed on some traits, for example maternal traits in the HDT, they still
• A slowly increasing cow weight/size, and milk production New Zealand Angus Heifer/Dairy Terminal Index - Predicted Response may be selected for indirectly through positive or negative correlations
with other traits, as is the case with Days to Calving in the HDT.
14
Expected Change in Individual Traits

CEd CEm GL BW 200W 400W 600W MCW Milk SS DC Cwt EMA Rib Rump RBY IMF
Above the 0 line (X axis) selects for more positive numbers and below the line selects
for more negative numbers. For some traits (e.g. growth), a positive response is
desirable and for others (e.g. days to calving), a negative response is desirable.
This index is primarily driven by getting live calves on the ground,
and producing an early maturing prime animal with added carcase traits
for improved carcase yield and marbling with no direct selection for
maternal traits.