Biography:

In the past D.L. Lalman has collaborated on articles with M.A. Brown. One of their most recent publications is Milk Yield and Quality in Cows Sired by Different Beef Breeds12. Which was published in journal The Professional Animal Scientist.

More information about D.L. Lalman research including statistics on their citations can be found on their Copernicus Academic profile page.

D.L. Lalman's Articles: (3)

Milk Yield and Quality in Cows Sired by Different Beef Breeds12

ABSTRACTBreed differences in milk production and milk quality are related to differences in calf preweaning growth, differences in cow maintenance requirements, and differences in efficiency of production. Cows from Brangus dams and sired by 12 Bonsmara, 12 Brangus, 15 Charolais, 18 Gelbvieh, 13 Hereford, and 13 Romosinuano sires were sampled in 2005 (n = 45), 2006 (n = 50), 2007 (n = 53), and 2008 (n = 50) to evaluate sire breed differences in milk yield and quality. There was little evidence of daily milk yield differences among cows sired by Bonsmara, Brangus, Charolais, Gelbvieh, or Hereford sires, but Romosinuano-sired cows produced less milk (P < 0.05) than the other breed groups. Gelbvieh-sired cows had less milk fat than Bonsmara-, Charolais-, Hereford-, and Romosinuano- sired cows (P < 0.05) but not Brangus-sired cows. Percentage of milk protein was greater in Romosinuanosired cows than in Brangus-, Charolais-, Gelbvieh-, and Hereford-sired cows (P < 0.05), whereas percentage of milk protein was greater in Bonsmara-sired cows than in Charolais- and Gelbvieh-sired cows (P < 0.05). Percentage of milk lactose was similar for Bonsmara- and Romosinuano-sired cows, which both had greater percentages of milk lactose than Hereford-sired cows (P < 0.05). Somatic cell counts for Romosinuano-sired cows were less than those of Bonsmara-, Charolais-, Gelbvieh-, and Herefordsired cows (P < 0.05) but not Brangussired cows. The lack of differences in milk yield among the sire breeds, with the exception of Romosinuano, suggests possible nutritional limitations on native rangeland that prevent expression of the full genetic potential for milk yield. The lower milk yields and SCC in the Romosinuano suggest possible advantages for this breed in efficiency of production and mastitis resistance.

Preweaning Performance of Calves from Bonsmara, Brangus, Charolais, Gelbvieh, Hereford, and Romosinuano Sires Bred to Brangus Cows Managed on Native Rangeland or Improved Forages1, 2

AbstractPreweaning data on 511 spring-born calves from 187 Brangus cows and 129 Bonsmara, Brangus, Charolais, Gelbvieh, Hereford, and Romosinuano sires were measured over a 4-yr period to determine sire breed, sex, and age of dam differences under 2 preweaning forage environments: 1) native tallgrass rangeland (native) or 2) improved warm-season forages (improved). Sire breed differences in birth weight varied across forage (P < 0.05) with Romosinuano-sired calves on improved forages ranked intermediate in birth weight compared with other sire breeds but lightest on native forages. Calves from Charolais and Gelbvieh tended to be heavier at 205 d of age than calves from other sire breeds on improved forages (P < 0.05, except Gelbvieh vs. Hereford, P < 0.12) whereas on native forages, Bonsmara-, Charolais-, and Gelbvieh-sired calves were similar but were heavier than Brangus- and Romosi-nuano-sired calves (P < 0.10). Steer calves were heavier than heifer calves on improved forages (P < 0.01) but not on native forages. Sire breed differences were not significant on improved forages for weaning condition score. On native forage, weaning condition scores were greater for calves sired by Bonsmara and Hereford (P < 0.05) compared with Brangus-, Charolais-, and Gelbvieh-sired calves, and Charolais-sired calves were lesser than other sire breeds (P < 0.05). These results provide evidence of nonadditive associations between preweaning forage systems, sire breed of calves, age of dam, and sex of calf in preweaning traits. Consideration should be given to appropriate combinations of these effects in development of efficient cow-calf production systems.

ORIGINAL RESEARCH: Production and ManagementWeaning weight trends in the US beef cattle industry

ABSTRACTThe objective of this study was to characterize the trend over time for weaning BW in commercial cow-calf operations in the US beef cattle industry. The first data set contained weaning BW data from 4 enterprise analysis programs from 1991 to 2015. The second data set included mean forecasted delivery BW of sale lots of beef calves sold through Superior Livestock Auction from 1995 to 2016. The Superior Livestock Auction data were evaluated for 2 regions, north central/Rocky Mountain region and south central region, and were restricted to sale dates and projected delivery dates approximating those associated with spring-calving operations. The third data set included mean actual and adjusted weaning BW of commercial cow-calf operations participating in the Alabama Beef Cattle Improvement Association from 1983 to 2017. Adjusted annual weaning BW reported from the American Angus Association and American International Charolais Association were used to evaluate the trend over time for Angus and Charolais bull calves from 1995 to 2016. Annual mean weaning BW from 3 of 4 different cow-calf performance and financial analysis programs did not change over time (P > 0.16). However, there was a significant linear increase (0.5 kg per year; P = 0.01) for weaning BW in data reported by the Kansas Farm Management Association. Projected delivery BW for north central implanted calves increased (P < 0.01) until 2006 and plateaued at 268.7 kg. Similarly, projected delivery BW for north central nonimplanted calves increased (P < 0.01) until 2007 and plateaued at 249.8 kg. In contrast, projected delivery BW for nonweaned south central implanted and nonimplanted calves increased (P < 0.01) over time with no significant break point and was best characterized by a simple linear model. Adjusted and unadjusted weaning BW reported to the Alabama Beef Cattle Improvement Association increased until 1998 and 1995 and plateaued at 252.6 and 250.6 kg, respectively. The phenotypic trend for Angus and Charolais bulls was best described by a polynomial regression equation (P < 0.01) with declining rate of change in weaning BW. Substantial variation in the trend over time for weaning BW in commercial cow-calf operations exists within region and record program. Nevertheless, it is apparent that progress in calf weaning BW among commercial cow-calf operations has stabilized in some regions of the United States. Furthermore, weaning BW is substantially more variable in the southern states.

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