Association of age at first calving with longevity, milk yield, and fertility up to the third lactation in a herd of Holstein dairy cows in Japan

KUSAKA, Hiromi; YAMAZAKI, Takeshi; SAKAGUCHI, Minoru

doi:10.1262/jrd.2023-012

Cited by 1 publication

(1 citation statement)

References 27 publications

(43 reference statements)

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“…Similar negative effect of lower AFC on production was reported in earlier literature (Pirlo et al, 2000). In contrast, better long-term milk production was also observed in heifers calving at younger age (Kusaka et al, 2023). Further, the authors advocated that Holstein heifers with early AFC have the potential to increase herd productivity with longer survivability.…”

Section: Survival Ratesupporting

confidence: 71%

Impact of age at first calving on fertility and production performance in Murrah buffalo

Rautela,

Kumar,

Sharma

et al. 2024

Reprod Domestic Animals

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The present study analyses the effect of age at first calving (AFC) on future fertility and productivity in Murrah buffaloes. The data of 314 buffalo heifers of animal farm section, ICAR‐CIRB, Hisar were collected over a period of 9 years from 2010 to 2018. The buffalo heifers were categorized into six groups according to the AFC named as 30–35, 36–41, 42–47, 48–53, 54–59 and 60–65 months. The influence of AFC on standard lactation milk (SLMY), peak yield (PY), days in milk (DIM), calving to first service, service per conception, calving to conception interval (CCI) and calving interval till fifth lactation were studied. The study revealed poor productive traits in buffalo heifers calved at younger age (30–35 months) during first parity. The productive value positively corresponded with increase in AFC. During successive lactations, higher mean milk yield (SLMY and PY) was found in groups with 36–41, 42–47 and 48–53 months. The mean number of services per conception was lower in buffalo heifers with 36–41 and 42–47 months following first calving till fifth lactation. Similarly, the said groups had lower mean calving to first service, CCI and CI up to fifth lactation. The survival rate was higher in heifers with AFC 36–41, 42–47, 48–53 and 54–59 months than with AFC 30–35 and 60–65 months. The buffalo heifers with 36–41 and 42–47 months of AFC had higher survival rate and better productive and reproductive traits till fifth parity in the current study. The study concluded that a minimum ideal AFC of 36–41 months yielded the highest productive gain.

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Section: Survival Ratesupporting

confidence: 71%