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27 results on '"Shaver, Randy D."'

4. Effects of feeding rumen-protected methionine pre- and postpartum in multiparous Holstein cows: Health disorders and interactions with production and reproduction

Author

Toledo, Mateus Z., primary, Stangaferro, Matias L., additional, Caputo Oliveira, Rafael, additional, Monteiro, Pedro L.J., additional, Gennari, Rodrigo S., additional, Luchini, Daniel, additional, Shaver, Randy D., additional, Giordano, Julio O., additional, and Wiltbank, Milo C., additional

Published
2023
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7. Effects of feeding rumen-protected methionine pre- and postpartum on reproductive outcomes of multiparous Holstein cows

Author

Stangaferro, Matias L., primary, Toledo, Mateus Z., additional, Gennari, Rodrigo S., additional, Perez, Martin M., additional, Gamarra, Caio A., additional, Sitko, Emily M., additional, Monteiro, Pedro L.J., additional, Masello, Magdalena, additional, Prata, Alexandre B., additional, Granados, German E., additional, Van Amburgh, Michael E., additional, Luchini, Daniel, additional, Shaver, Randy D., additional, Wiltbank, Milo C., additional, and Giordano, Julio O., additional

Published
2021
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8. Effects of feeding rumen-protected methionine pre- and postpartum in multiparous Holstein cows: Lactation performance and plasma amino acid concentrations

Author

Toledo, Mateus Z., primary, Stangaferro, Matias L., additional, Gennari, Rodrigo S., additional, Barletta, Rafael V., additional, Perez, Martin M., additional, Wijma, Robert, additional, Sitko, Emily M., additional, Granados, German, additional, Masello, Magdalena, additional, Van Amburgh, Michael E., additional, Luchini, Daniel, additional, Giordano, Julio O., additional, Shaver, Randy D., additional, and Wiltbank, Milo C., additional

Published
2021
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19. Displaced Abomasum

Author

Pehrson, Bo G. and Shaver, Randy D.

Abstract

Incidence of displaced abomasum (DA) in dairy cows is at least 10 times higher in Wisconsin herds than in Sweden, even though average fat-corrected milk production levels are similar. In southern Wisconsin an incidence of 2.5-3.5% appears normal (Dr. Rhoda, personal communication, Evansville, WI). Feed ingredient and breed differences may be associated with different incidence rates between countries. However, a preliminary investigation (Pehrson, unpublished) indicated that Wisconsin feeding and management practices during the peripartal period may be closely associated with the high incidence rate. The primary objective of the present study was to further evaluate this hypothesis (Trial B). A secondary objective was to collect clinical data with regard to occurrence of DA in the same geographic area (Trial A)., American Association of Bovine Practitioners Proceedings of the Annual Conference, 1992: Volume 1

Published
1992
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27. Quantitative Trait Loci for Ruminal Degradability in opaque endosperm2(o2) Maize

Author

Lebaka, Ntjapa G., Coors, James G., Shaver, Randy D., Bertics, Sandy, Gutiérrez‐Rojas, Andrés, Menz, Mónica, and Betrán, Javier

Abstract

Although opaque endosperm2(o2) gene that alters protein composition of maize (Zea maysL.) endosperm improves dry matter degradability (DMD) in ruminants it is also associated with soft endosperm texture, low yield, and susceptibility to diseases and insects. To circumvent the undesirable traits, breeders developed high lysine modified endosperm genotypes called quality protein maize (QPM). The objectives of this study were to determine whether DMD is maintained in modified endosperm and to map major quantitative trait loci (QTLs) associated with ruminal in situ DMD (RDMD). Composited 1.5‐g ground grain samples of 140 recombinant inbred lines (RILs) derived from the cross between o2(B73o2) and QPM (CML161) lines were assayed for 14‐h RDMD in three rumen‐cannulated, mid‐lactation Holstein cows (Bos taurus) and 0‐h rapidly soluble dry matter (RSDM) in tepid water. The RILs were grown in Texas and were evaluated for RDMD at Madison, WI. Slowly degradable dry matter (SDDM = RDMD – RSDM) was estimated. Kernel opacity was positively correlated to 14‐h RDMD (r= 0.68 and 0.71 in 2005 and 2006, respectively; P< 0.05). Quantitative trait loci for 14‐h RDMD were detected on chromosomes 4, 5, 7, 9, and 10; QTLs for RSDM were detected on chromosomes 3, 5, 7, and 10; and QTLs for SDDM were detected on chromosomes 5, 6, and 9. Quantitative trait loci for 14‐h RDMD and RSDM colocated on chromosomes 5, 7, and 10 might be genomic regions influencing 14‐h RDMD mainly through kernel modification. Quantitative trait loci for 14‐h RDMD and/or SDDM, on chromosomes 6 (SDDM) and 9 (colocated) where 14‐h RDMD appears to be mediated through SDDM and most likely enzymatic RDMD, may be good candidates for improvement of RDMD.

Published
2013
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