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Shike, Daniel W. Clements, Alyssa Robin 2016-03-02T19:45:05Z 2016-03-02T19:45:05Z 2015-12-09 2015-12 Mature Simmental × Angus cows (214 cows; 635 ± 7.4 kg) were utilized to determine the effects of late gestation and early postpartum supplementation of methionine hydroxy analog (MFP; Novus International, Inc., St. Charles, MO, USA) on cow BW, BCS, milk production, milk composition, reproduction, and calf performance until weaning in a fall-calving, coolseason grazing system. Cows were confirmed pregnant prior to experiment, stratified by BW, cow age and AI sire, and assigned to one of twelve pastures (17 or 18 cows·pasture-1). Pastures were randomly allotted to one of two treatments: control (0.45 kg·cow-1·d-1 of wheat mid-based pellets, n = 6) or supplement including MFP (0.45 kg·cow-1·d-1 of wheat mid based pellets including 10 g MFP, n = 6). Treatments were fed 23 ± 1 d prior to calving through 72 ± 1 d postpartum. Cows were weighed post-calving, at supplementation end, AI breeding, AI pregnancy check, and the end of trial (192 and 193 ± 1 d postpartum). At 74 d postpartum, a subset of cow-calf pairs were used in a weigh-suckle-weigh to determine milk production and milk samples were taken to determine milk composition (n = 45·treatment-1). A serum P4 assay was utilized to determine cow cyclicity. After supplementation, all cow-calf pairs were managed as a common group until weaning (191 ± 1 d of age). Cows were bred via AI at 97 ± 1 d postpartum and clean-up bulls were turned out 11 d post-AI for a 55 d breeding season. Cow and calf performance were analyzed using MIXED procedure in SAS (SAS Inst. Inc., Cary, NC) and cow reproductive performance and calf health were analyzed using GLIMMIX procedure. Cow BW and BCS were not different (P ≥ 0.10) at any time points between treatments. There was no treatment effect (P ≥ 0.62) on calf birth BW, calf weaning BW (191 ± 1 d of age), or calf ADG. Calculated 24 h milk production did not differ (P = 0.76) nor did milk composition or component production (P ≥ 0.21). There was no difference (P = 0.69) in percentage of cows cycling between treatments. Cow AI conception rate and overall pregnancy rate were not different (P ≥ 0.50) between treatments. No differences (P ≥ 0.61) in calf health were observed. Supplementation of MFP during late gestation through estimated peak lactation did not affect cow performance, cow milk production, or calf performance when fall-calving cows grazed cool-season forages. Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2016-03-02 without embargo terms The student, Alyssa Clements, accepted the attached license on 2015-12-09 at 11:14. The student, Alyssa Clements, submitted this Thesis for approval on 2015-12-09 at 11:19. This Thesis was approved for publication on 2015-12-09 at 16:06. DSpace SAF Submission Ingestion Package generated from Vireo submission #8984 on 2016-03-02 at 12:53:01 Made available in DSpace on 2016-03-02T19:45:05Z (GMT). No. of bitstreams: 2 CLEMENTS-THESIS-2015.pdf: 585520 bytes, checksum: 778f4566bfb84887db29f234b8951e8a (MD5) LICENSE.txt: 4212 bytes, checksum: f6b6863e06de0f9c89e5c3cd9f90d134 (MD5) Previous issue date: 2015-12-09 application/pdf http://hdl.handle.net/2142/89081 en Copyright 2015 Alyssa Clements cow-calf fall-calving late gestation supplementation methionine hydroxy analog milk production reproduction Effects of supplementing methionine hydroxy analog on beef cow performance, milk production, and reproduction text text Animal Sciences Animal Sciences University of Illinois at Urbana-Champaign Thesis M.S.