The Effect of Sex on Weaning Weight of Range Calves

Koger, M.; Knox, J. H.

doi:10.2527/jas1945.4115

Cited by 20 publications

(13 citation statements)

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“…Nevertheless, gender was not a significant covariate for weaning variables (P ≥ 0.45). Although steers are expected to have greater weaning BW compared with heifers (Koger and Knox, 1945), steers and heifers had similar (P ≥ 0.45) weaning age (182 vs. 183 d [SEM 3], respectively), weaning BW (223 vs. 224 kg [SEM 5], respectively), and 205-d adjusted weaning BW (254 vs. 252 kg [SEM 5], respectively) in the present experiment. Therefore, treatment effects detected for weaning BW variables should also not be associated with the greater (P ≤ 0.05) proportion of male calves born from INR and AAC cows (Table 6).…”

Section: Calf Birth and Weaning Parametersmentioning

confidence: 66%

Effects of organic or inorganic cobalt, copper, manganese, and zinc supplementation to late-gestating beef cows on productive and physiological responses of the offspring1

Marques

Cooke

Rodrigues

et al. 2016

Journal of Animal Science

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Eighty-four multiparous, nonlactating, pregnant Angus × Hereford cows were ranked by pregnancy type (56 AI and 28 natural service), BW, and BCS and allocated to 21 drylot pens at the end of their second trimester of gestation (d 0). Pens were assigned to receive forage-based diets containing 1) sulfate sources of Cu, Co, Mn, and Zn (INR); 2) an organic complexed source of Cu, Mn, Co, and Zn (AAC; Availa 4; Zinpro Corporation, Eden Prairie, MN); or 3) no supplemental Cu, Co, Mn, and Zn (CON). Diets were offered from d 0 until calving and formulated to meet requirements for energy, protein, macrominerals, Se, I, and vitamins. The INR and AAC diets provided the same daily amount of Cu, Co, Mn, and Zn. Cow BW and BCS were recorded and liver samples were collected on d -10 and 2 wk (d 75) before the calving season. Within 3 h after calving, calf BW was recorded, liver samples were collected, and the expelled placenta was retrieved ( = 47 placentas). Calves were weaned on d 283 of the experiment, preconditioned for 45 d (d 283 to 328), transferred to a growing lot on d 328, and moved to a finishing lot on d 440 where they remained until slaughter. Liver Co, Cu, and Zn concentrations on d 75 were greater ( ≤ 0.05) for INR and AAC cows compared with CON cows, whereas INR cows had reduced ( = 0.04) liver Co but greater ( = 0.03) liver Cu compared with AAC cows. In placental cotyledons, Co concentrations were greater ( ≤ 0.05) in AAC and INR cows compared with CON cows, whereas Cu concentrations were increased ( = 0.05) only in AAC cows compared with CON cows. Calves from INR and AAC cows had greater ( < 0.01) liver Co concentrations at birth compared with calves from CON cows. Liver Cu and Zn concentrations at birth were greater ( ≤ 0.05) in calves from AAC cows compared with cohorts from CON cows. Weaning BW was greater ( ≤ 0.05) in calves from AAC cows compared with cohorts from CON cows, and this difference was maintained until slaughter. In the growing lot, calves from AAC cows had reduced ( < 0.01) incidence of bovine respiratory disease compared with CON and INR cohorts. Collectively, these results suggest that feeding the AAC diet to late-gestating beef cows stimulated programming effects on postnatal offspring growth and health compared with the CON diet. Therefore, supplementing late-gestating beef cows with an organic complexed source of Co, Cu, Zn, and Mn instead of no supplementation appears to optimize offspring productivity in beef production systems.

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Section: Calf Birth and Weaning Parametersmentioning

confidence: 66%

Effects of organic or inorganic cobalt, copper, manganese, and zinc supplementation to late-gestating beef cows on productive and physiological responses of the offspring1

Marques

Cooke

Rodrigues

et al. 2016

Journal of Animal Science

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show abstract

“…, 1942and Woolfolk and Knapp, 1949). Sex differences in weaning weight have also been reported by many workers (Burgess et al, 1954;Gregory et al, 1950;Koch, 1951;Koch and Clark, 1955a;Koger and Knox, 1945;Rollins and Guilbert, 1954;Rollins and Wagnon, 1956;Swiger, 1960Swiger, , 1961and Woolfolk and Knapp, 1949). Swiger (1960) Nelms and Bogart (1955) reported that bull calves decrease in ef ficiency more rapidly than heifers as they grow in body weight from 500 to 800 pounds.…”

Section: Effect Of Sexsupporting

confidence: 56%

Genetic aspects of growth rate and feed utilization in beef cattle

Ahmad

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“…As would be expected, the largest constants were observed for 2, 3, and 4 year old dams. Koch (1951) In several studies where the calves were weaned at 205 days the males exceeded the females by 26, 30, 29, 34 and 32 pounds (Koger and Knox, 1945a;Koger and Knox, 1947;Rice et al , 1954;Reynolds _et al , 1958;Meade jet , 1961), respectively. Similar values for calves weaned at 210 days were 25, 22 and 17, 38, 46, 39 pounds (Botkin and Whatley, 1953;Evans et al,.…”

Section: Age Of Dammentioning

confidence: 98%

“…(1955) and Chambers _et (1956). Minyard and Dinkel (1960) The other most common methods of correcting for age of calf are by covariance analysis (Koger and Knox, 1945a) or by the regression of weight on age within year, sex, and age of dam subclass groups (Koger and Knox, 1945b;Koger and Knox, 1947). …”

Section: Personnel Associated With Federal Experiments Stations Weanmentioning

confidence: 99%

Beef calf weights at 100 days and 205 days as indicators of dams' producing ability

Drewry

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The Effect of Sex on Weaning Weight of Range Calves

Cited by 20 publications

References 1 publication

Effects of organic or inorganic cobalt, copper, manganese, and zinc supplementation to late-gestating beef cows on productive and physiological responses of the offspring1

Effects of organic or inorganic cobalt, copper, manganese, and zinc supplementation to late-gestating beef cows on productive and physiological responses of the offspring1

Genetic aspects of growth rate and feed utilization in beef cattle

Beef calf weights at 100 days and 205 days as indicators of dams' producing ability

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