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Table representation of search results timeline featuring number of search results per year.

Year Number of Results
1920 1
1923 1
1965 2
1966 5
1967 1
1968 4
1969 3
1970 1
1971 4
1972 2
1973 1
1975 11
1976 10
1977 17
1978 12
1979 19
1980 13
1981 13
1982 15
1983 39
1984 23
1985 29
1986 33
1987 31
1988 29
1989 43
1990 47
1991 40
1992 50
1993 37
1994 24
1995 27
1996 29
1997 37
1998 46
1999 27
2000 33
2001 42
2002 41
2003 46
2004 64
2005 65
2006 57
2007 56
2008 70
2009 91
2010 83
2011 87
2012 93
2013 95
2014 99
2015 108
2016 113
2017 126
2018 152
2019 134
2020 159
2021 39
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2,355 results
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Page 1
Influence of age at first calving in a continuous calving season on productive, functional, and economic performance in a Blonde d'Aquitaine beef population.
López-Paredes J, Pérez-Cabal MA, Jiménez-Montero JA, Alenda R. López-Paredes J, et al. J Anim Sci. 2018 Sep 29;96(10):4015-4027. doi: 10.1093/jas/sky271. J Anim Sci. 2018. PMID: 29986100 Free PMC article.
The only significant traits found in primiparous cows were late age at first calving, which resulted in heavier BW calves, and early age at first calving, which resulted in calves with greater carcass conformation scores. …
The only significant traits found in primiparous cows were late age at first calving, which resulted in heavier BW c
Associations between age at first calving and subsequent lactation performance in UK Holstein and Holstein-Friesian dairy cows.
Eastham NT, Coates A, Cripps P, Richardson H, Smith R, Oikonomou G. Eastham NT, et al. PLoS One. 2018 Jun 13;13(6):e0197764. doi: 10.1371/journal.pone.0197764. eCollection 2018. PLoS One. 2018. PMID: 29897929 Free PMC article.
Within the study, only 48,567 heifers (12.3% of the studied population) calved for the first time at 24 months of age or younger. 162,157 heifers (40.9%) were 30 months or older at their first calving. ...Our results highlight the importance of …
Within the study, only 48,567 heifers (12.3% of the studied population) calved for the first time at 24 months of age o …
Genomic evaluation of age at first calving.
Hutchison JL, VanRaden PM, Null DJ, Cole JB, Bickhart DM. Hutchison JL, et al. J Dairy Sci. 2017 Aug;100(8):6853-6861. doi: 10.3168/jds.2016-12060. Epub 2017 Jun 16. J Dairy Sci. 2017. PMID: 28624286 Free article.
From their time of birth until their first lactation, dairy heifers incur management, health, and feed expenses while not producing milk. Much effort has been made to estimate optimal ages of first calving (AFC) for cows to reduce these costs, which can be as …
From their time of birth until their first lactation, dairy heifers incur management, health, and feed expenses while not producing m …
Genotype-environment interaction for age at first calving in buffaloes, using the reaction norm model.
Freitas GR, Hurtado-Lugo NA, de Abreu Dos Santos DJ, Aspilcueta Borquis RR, Pegolo NT, Tonhati H, de Araújo Neto FR. Freitas GR, et al. Reprod Domest Anim. 2019 Apr;54(4):727-732. doi: 10.1111/rda.13414. Epub 2019 Mar 4. Reprod Domest Anim. 2019. PMID: 30740786
The objective of this study was to evaluate the genotype-environment interaction effect on age at first calving in buffaloes. The records were analysed using two approaches: (a) standard animal model and (b) reaction norm model. ...Based on our findings, we v …
The objective of this study was to evaluate the genotype-environment interaction effect on age at first calving in buff …
Age at first calving in UK Jersey cattle and its associations with first lactation 305-day milk yield, lifetime daily milk yield, calving interval and survival to second lactation.
Boothby F, Grove-White D, Oikonomou G, Oultram JWH. Boothby F, et al. Vet Rec. 2020 Dec 19;187(12):491. doi: 10.1136/vr.105993. Epub 2020 Aug 6. Vet Rec. 2020. PMID: 32764036
BACKGROUND: The association between age at fist calving (AFC) and production, fertility and survivability in Jersey heifers requires evaluation and comparison with published literature on Holstein heifers. ...Heifers that calved in the winter had a significan …
BACKGROUND: The association between age at fist calving (AFC) and production, fertility and survivability in Jersey heifers re …
A large-scale study on the effect of age at first calving, dam parity, and birth and calving month on first-lactation milk yield in Holstein Friesian dairy cattle.
Van Eetvelde M, de Jong G, Verdru K, van Pelt ML, Meesters M, Opsomer G. Van Eetvelde M, et al. J Dairy Sci. 2020 Dec;103(12):11515-11523. doi: 10.3168/jds.2020-18431. Epub 2020 Oct 15. J Dairy Sci. 2020. PMID: 33069403
Milk yield during first lactation is an important economical trait. Age at first calving (AFC) is considered an important predictor of subsequent milk yield. ...R(2) = 0.002, respectively), with the highest first-lactation production in heifers …
Milk yield during first lactation is an important economical trait. Age at first calving (AFC) is considered an …
Association between age at first calving and lactation performance, lactation curve, calving interval, calf birth weight, and dystocia in Holstein dairy cows.
Atashi H, Asaadi A, Hostens M. Atashi H, et al. PLoS One. 2021 Jan 4;16(1):e0244825. doi: 10.1371/journal.pone.0244825. eCollection 2021. PLoS One. 2021. PMID: 33395420 Free PMC article.
In the present study, records on 115,291 heifers distributed in 113 herds were used to investigate the association between age at the first calving (AFC) and lactation performance, lactation curve, the length of the first calving interval (CI), …
In the present study, records on 115,291 heifers distributed in 113 herds were used to investigate the association between age at the …
The effect of age at first calving and calving interval on productive life and lifetime profit in korean holsteins.
Do C, Wasana N, Cho K, Choi Y, Choi T, Park B, Lee D. Do C, et al. Asian-Australas J Anim Sci. 2013 Nov;26(11):1511-7. doi: 10.5713/ajas.2013.13105. Asian-Australas J Anim Sci. 2013. PMID: 25049735 Free PMC article.
Reducing age at first calving and first calving interval had a positive effect on lifetime profit. ...In conclusion, regard of the age at first calving must be taken with the optimum age at first calving
Reducing age at first calving and first calving interval had a positive effect on lifetime profit. ...In …
Relationship of body weight at first calving with milk yield and herd life.
Han L, Heinrichs AJ, De Vries A, Dechow CD. Han L, et al. J Dairy Sci. 2021 Jan;104(1):397-404. doi: 10.3168/jds.2020-19214. Epub 2020 Nov 6. J Dairy Sci. 2021. PMID: 33162084
The objectives of this study were to investigate the association of body weight (BW) at first calving (BWFC) and maturity rate (MR; BWFC as a percentage of mature BW) with first-lactation 305-d milk yield (FLMY), milk yield (MY) in the 24 mo following firs
The objectives of this study were to investigate the association of body weight (BW) at first calving (BWFC) and maturity rate …
Calving day and age at first calving in Angus heifers.
Minick Bormann J, Wilson DE. Minick Bormann J, et al. J Anim Sci. 2010 Jun;88(6):1947-56. doi: 10.2527/jas.2009-2249. Epub 2010 Feb 12. J Anim Sci. 2010. PMID: 20154171
The objective of this study was to determine the heritabilities (direct and maternal) for CD (calving day) and AFC (age at first calving) in American Angus heifers and to evaluate the potential for using these traits in genetic improvement of female fe …
The objective of this study was to determine the heritabilities (direct and maternal) for CD (calving day) and AFC (age at …
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