Relationship of anabolic status and phase and rate of growth to priorities for protein and fat deposition in steers.

Abstract

The effects of anabolic implants, growth phase (growing vs finishing) and rate of growth on the priorities for protein and fat deposition were determined in yearling cattle. Santa Gertrudis crossbred yearling steers weighing 290 kg were individually fed diets varying in forage and grain content and either not implanted (n = 16) or implanted (90-d intervals) with Ralgro (n = 13) or Synovex-S (n = 12) implants. The cattle were fed toward a similar expected final empty BW (455 kg). Initial and interim empty body composition was measured via deuterium oxide dilution; final composition was determined by carcass specific gravity. During a 100-d growing phase, rates of protein gain were increased (P less than .12) to 118 and 131 g/d from 98 g/d for Ralgro and Synovex vs nonimplanted cattle, respectively. Concurrently, the fraction of protein in empty body growth was increased (P less than .09) from 17.5% for controls to 23.8 and 19.7% for Ralgro- and Synovex-implanted steers, respectively. This change in protein growth occurred concomitant with mobilization of fat and a reduction (P less than .04) in fat gain with Ralgro and Synovex implants. During the 136-d finishing phase, protein accretion was 115 and 132 vs 93 g/d for Ralgro- and Synovex-implanted cattle vs nonimplanted cattle; this represented a 24 and 42% increase (P less than .03) with Ralgro and Synovex, respectively.(ABSTRACT TRUNCATED AT 250 WORDS)

Influence of incremental zeranol implant doses on the chemical and physical characteristics of third metacarpal bone and chemical composition of liver and soft tissue from feedlot steers.

“…Zeranol levels of 36 mg or higher resulted in an increase ( P < .05) in hot carcass weight over controls (Byers et al, 1990); however, there was no effect of treatment on the weight (.79 vs .79 kg for control vs treated; P > .15) or percentage of bone (15.6 vs 15.5% for control vs treated; P > .15) in the 9-10-1 1 rib section. Hot carcass weight was 318.5, 320.2, 318.9, 323.8, 319.5, and 320.3 kg for the 36, 48, 60, 72, 84, and 96 mg zeranol doses, compared with 308.0 kg for ZEFUNOL EFFECTS ON STEER BONE AND SOFT TISSUE 3 controls.…”

“…Figure 1. Relationship of lean retail product (Byers et al, 1990) and bone Ca and bone P concentrations to zeranol dose. Increasing zeranol dose resulted in increasing and then decreasing lean retail product (P < .05, R2 = .773) and decreasing and then increasing bone Ca (P < .01, R2 = .58) and bone P (P = .11, R2 = .36).…”

“…Zeranol implants (Pitman Moore, Mundelein, IL) have been used for many years to improve rate of growth in cattle (Lemieux et al, 1990) and alter body composition so that the quantity of lean retail product (contains both edible soft tissue and bone) from a carcass increases (Byers et al, 1990). Solis et al ( 1987) demonstrated that serum mineral concentrations are modified when cattle are implanted with either estradioliprogesterone-or zeranol-containing implants.…”

ZEN and the art of breast health maintenance

“…Moreover, an increased skeletal maturity was documented in comparison with untreated control animals. Anabolic treatment increases protein gain and reduces fat deposition, particularly in heifers (50)(51)(52)(53). Several studies testing the administration of low doses of Zeranol to various species indicated that there appears to be minimal toxicity with non-carcinogenic, non-teratogenic and non-mutagenic activity.…”

Genótipo e condição sexual no desempenho e nas características de carcaça de bovinos de corte superjovens

“…O resumo das análises de variância indica que a condição sexual influenciou (P<0,01) o peso final, o peso de carcaça quente e o grau de acabamento (Tabela 2), confirmando os dados divulgados por Solis et al (1989), Lemieux et al (1990), Restle et al (1994a) e Restle et al (1996), enquanto Shackelford et al (1992), trabalhando com bovinos de corte em confinamento, não observaram influên-cia de condição sexual sobre características de desempenho.…”