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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 16
1983 39
1984 24
1985 29
1986 35
1987 35
1988 30
1989 43
1990 47
1991 40
1992 50
1993 37
1994 24
1995 28
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 127
2018 152
2019 136
2020 168
2021 180
2022 107
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Search Results

2,596 results
Results by year
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Page 1
Genetic relationship of age at first calving with conformation traits and calving interval in Hanwoo cows.
Shin S, Lee J, Do C. Shin S, et al. J Anim Sci Technol. 2021 Jul;63(4):740-750. doi: 10.5187/jast.2021.e73. Epub 2021 Jul 31. J Anim Sci Technol. 2021. PMID: 34447951 Free PMC article.
The data sets of 52,299 reproduction records of 19,566 heads calved from 2011 to 2019 and conformation records of 19565 heads born from 1997 to 2017 were analyzed by separating them based on age at first calving. ...Additional research is needed to per …
The data sets of 52,299 reproduction records of 19,566 heads calved from 2011 to 2019 and conformation records of 19565 heads born fr …
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 …
Identification of novel candidate genes for age at first calving in Nellore cows using a SNP chip specifically developed for Bos taurus indicus cattle.
Dubon MAC, Pedrosa VB, Feitosa FLB, Costa RB, de Camargo GMF, Silva MR, Pinto LFB. Dubon MAC, et al. Theriogenology. 2021 Oct 1;173:156-162. doi: 10.1016/j.theriogenology.2021.08.011. Epub 2021 Aug 8. Theriogenology. 2021. PMID: 34392169
The age at first calving has a great economic impact on the beef cattle system and calving at 24 months is an objective of selection for a more efficient herd. However, an age at first calving around 36 months has been observed for …
The age at first calving has a great economic impact on the beef cattle system and calving at 24 months is an ob …
Evaluation of the effects of sire and dam calving group on age at first calving in Brahman heifers.
Earnhardt AL, Neuendorff DA, Long CR, Welsh TH Jr, Randel RD. Earnhardt AL, et al. Theriogenology. 2021 Jun;167:32-36. doi: 10.1016/j.theriogenology.2021.03.005. Epub 2021 Mar 9. Theriogenology. 2021. PMID: 33744769
A calving group was determined by calculating the mean (993 d) and standard deviation (187 d) of heifer age at first calving. ...Data were analyzed using the GLM procedures of SAS and proportions were tested using Chi-square. Sire calving group …
A calving group was determined by calculating the mean (993 d) and standard deviation (187 d) of heifer age at first
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 Free article.
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 …
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 …
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
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 Free article.
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 …
The association between age at first calving and survival of first lactation heifers within dairy herds.
Sherwin VE, Hudson CD, Henderson A, Green MJ. Sherwin VE, et al. Animal. 2016 Nov;10(11):1877-1882. doi: 10.1017/S1751731116000689. Epub 2016 May 2. Animal. 2016. PMID: 27132864 Free article.
The objective of this research was to evaluate the survival rate of primiparous heifers within a large sample of herds across the United Kingdom and specifically to assess the association between age at first calving (AFC) on their survival. Data from 437 her …
The objective of this research was to evaluate the survival rate of primiparous heifers within a large sample of herds across the United Kin …
2,596 results