Effects of short-term nutritional increase before artificial insemination on average daily gain and reproductive efficiency in March-calving beef heifer development systems

Tadich, LF; Rogers, RES; Funston, RN

Effects of short-term nutritional increase before artificial insemination on average daily gain and reproductive efficiency in March-calving beef heifer development systems

Tadich, LF Rogers, RES Funston, RN

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Publisher:: ELSEVIER SCIENCE INC
Publication Type:: Journal Article
Citation:: Applied Animal Science, 2024, 40, (2), pp. 191-198
Issue Date:: 2024-04-01

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Field	Value	Language
dc.contributor.author	Tadich, LF
dc.contributor.author	Rogers, RES
dc.contributor.author	Funston, RN
dc.date.accessioned	2025-04-22T05:49:13Z
dc.date.available	2025-04-22T05:49:13Z
dc.date.issued	2024-04-01
dc.identifier.citation	Applied Animal Science, 2024, 40, (2), pp. 191-198
dc.identifier.issn	2590-2873
dc.identifier.issn	2590-2865
dc.identifier.uri	http://hdl.handle.net/10453/186950
dc.description.abstract	Objective: Our objective was to evaluate increased nu- tritional energy before AI on BW, ADG, and reproductive efficiency in heifers developed on range or in a drylot. Materials and Methods: A 3-yr study used Angus crossbred heifers (n = 100/yr) near North Platte, Nebras- ka. Heifers were stratified by BW and assigned to 1 of 3 treatments. During winter development (131 ± 3.5 d/yr), heifers grazed upland range (RANGE) or were fed a drylot diet in 2 pens with a targeted gain of 0.68 kg/d to achieve 65% of mature BW (6.35 kg/head per day hay, 2.27 kg/ head per day wet corn gluten feed, and 0.34 kg/head per day supplement). Thirty-three days before AI, one dry- lot group remained on this diet (DLLO) while the other (DLHI) received an additional 4.08 kg/head per day wet corn gluten feed. Heifers developed on RANGE received 0.45 kg/head per day of a 29% CP, dried distillers grain– based pellet until 38 d before AI, when they were fed the DLLO diet. Results and Discussion: Prebreeding BW was great- er for DLHI (375 ± 3.4 kg) and DLLO (363 ± 3.4 kg) compared with RANGE (312 ± 3.4 kg), but breeding ADG was greater for RANGE (0.69 ± 0.01 kg) compared with DLHI (0.35 ± 0.02 kg) and DLLO (0.37 ± 0.02 kg). Pregnancy rates to AI were similar among DLHI (69%), DLLO (63%), and RANGE (49%); final pregnancy rates tended to be different: DLHI (96%), DLLO (95%) and RANGE (84%). Calving rate and calving in the first 21 d was similar. Implications and Applications: Greater nutrient and energy intake for DLHI and DLLO led to greater BW and ADG compared with RANGE, but short-term nutri- tional increase had no effect on pregnancy rate to AI nor final pregnancy rates.
dc.language	English
dc.publisher	ELSEVIER SCIENCE INC
dc.relation.ispartof	Applied Animal Science
dc.relation.isbasedon	10.15232/aas.2023-02399
dc.rights	info:eu-repo/semantics/openAccess
dc.title	Effects of short-term nutritional increase before artificial insemination on average daily gain and reproductive efficiency in March-calving beef heifer development systems
dc.type	Journal Article
utslib.citation.volume	40
pubs.organisational-group	University of Technology Sydney
pubs.organisational-group	University of Technology Sydney/Faculty of Science
pubs.organisational-group	University of Technology Sydney/Faculty of Science/School of Mathematical and Physical Sciences
utslib.copyright.status	open_access	*
dc.rights.license	This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0). To view a copy of this license, visit https://creativecommons.org/licenses/by/4.0/
dc.date.updated	2025-04-22T05:49:12Z
pubs.issue	2
pubs.publication-status	Published
pubs.volume	40
utslib.citation.issue	2

Abstract:

Objective: Our objective was to evaluate increased nu- tritional energy before AI on BW, ADG, and reproductive efficiency in heifers developed on range or in a drylot. Materials and Methods: A 3-yr study used Angus crossbred heifers (n = 100/yr) near North Platte, Nebras- ka. Heifers were stratified by BW and assigned to 1 of 3 treatments. During winter development (131 ± 3.5 d/yr), heifers grazed upland range (RANGE) or were fed a drylot diet in 2 pens with a targeted gain of 0.68 kg/d to achieve 65% of mature BW (6.35 kg/head per day hay, 2.27 kg/ head per day wet corn gluten feed, and 0.34 kg/head per day supplement). Thirty-three days before AI, one dry- lot group remained on this diet (DLLO) while the other (DLHI) received an additional 4.08 kg/head per day wet corn gluten feed. Heifers developed on RANGE received 0.45 kg/head per day of a 29% CP, dried distillers grain– based pellet until 38 d before AI, when they were fed the DLLO diet. Results and Discussion: Prebreeding BW was great- er for DLHI (375 ± 3.4 kg) and DLLO (363 ± 3.4 kg) compared with RANGE (312 ± 3.4 kg), but breeding ADG was greater for RANGE (0.69 ± 0.01 kg) compared with DLHI (0.35 ± 0.02 kg) and DLLO (0.37 ± 0.02 kg). Pregnancy rates to AI were similar among DLHI (69%), DLLO (63%), and RANGE (49%); final pregnancy rates tended to be different: DLHI (96%), DLLO (95%) and RANGE (84%). Calving rate and calving in the first 21 d was similar. Implications and Applications: Greater nutrient and energy intake for DLHI and DLLO led to greater BW and ADG compared with RANGE, but short-term nutri- tional increase had no effect on pregnancy rate to AI nor final pregnancy rates.

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http://hdl.handle.net/10453/186950