2021
DOI: 10.3168/jds.2021-20617
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Comparison of reproductive management programs for submission of Holstein heifers for first insemination with conventional or sexed semen based on expression of estrus, pregnancy outcomes, and cost per pregnancy

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Cited by 5 publications
(28 citation statements)
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“…2,54 Many dairy farms are inseminating heifers with sexed semen using once-daily detection of estrus as they have previously done with conventional semen, but recent randomized-controlled studies suggest this may be costly. 101,75,58 Thus, 2 limitations exist for reproductively managing heifers for first insemination based on once-daily detection of estrus. First, are the increased days to first insemination and pregnancy thereby increasing days on feed.…”
Section: Detection Of Estrusmentioning
confidence: 99%
“…2,54 Many dairy farms are inseminating heifers with sexed semen using once-daily detection of estrus as they have previously done with conventional semen, but recent randomized-controlled studies suggest this may be costly. 101,75,58 Thus, 2 limitations exist for reproductively managing heifers for first insemination based on once-daily detection of estrus. First, are the increased days to first insemination and pregnancy thereby increasing days on feed.…”
Section: Detection Of Estrusmentioning
confidence: 99%
“…Most of the heifers in the trial reported by Maicas et al (2019) were inseminated with SS semen (2.1 million sperm cells per straw) following observed estrus without use of a TAI protocol. A feature of the current study was that leaving the P4 device in situ for 6 d instead of the traditional 5 d prevented premature onset of estrus, and thereby avoided the requirement to AI a subset of heifers on the day before scheduled TAI as previously reported by Lauber et al (2021) . Since the purpose of the study was to AI 100% of heifers on the scheduled date regardless of estrus, the estrus status of the heifers was not recorded, although Lauber et al (2021) reported that 73% of heifers synchronized with the P4 device in situ for 6 d were in estrus 2 d later on the day of scheduled AI.…”
mentioning
confidence: 96%
“…The 5-d timed AI protocol, with a progesterone ( P4 ) device inserted for 5 d, is well established ( Rabaglino et al, 2010 ; Lima et al, 2013 ), but the efficacy of this protocol for TAI is not optimal because removal of the intravaginal P4 device on d 5 coincident with the administration of the first injection of PGF 2α results in ~30% of heifers displaying estrus within the following 36 to 48 h, requiring AI 12 to 24 h before the scheduled TAI ( Chebel and Cunha, 2020 ; Lauber et al, 2021 ; Macmillan et al, 2021 ). This situation increases the labor associated with breeding heifers but can be overcome by leaving the intravaginal P4 device in situ for an additional 24 h until d 6, which prevents estrus on the day before scheduled TAI ( Lauber et al, 2021 ). On the other hand, because no heifers express estrus ahead of the scheduled TAI, the timing of AI to be coincident with exogenous GnRH may be too early relative to ovulation for a large proportion of heifers that require that exogenous GnRH before initiating a LH surge to trigger ovulation.…”
mentioning
confidence: 99%
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