Page 44 - Tapiri Angus 2021 Catalogue ebook

• Progeny will be prime at heavy carcase weights where the improved
AngusPure Index (API) marbling and subsequent eating quality traits can be expressed.
New Zealand Angus AngusPure Index - Predicted Response
These characteristics are ideal for an environment where the cow herd can
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 performance when feed is abundant. Finished progeny can be taken to
heavier weights with increased likelihood of achieving marbling premiums.
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
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
by regular seasonal feed deficits, maintaining body condition is critical to
Genetic Selection of bulls using only the API tool will on average over longevity and feeding out is not a viable option.
time develop a cow herd with the following:
• Improved weaning rate through increased fertility and easier calving
• A slowly increasing cow weight/size, and milk production
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