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ABSTRACT
During the autumn and spring grazing periods of 4 yr, performance of growing steers
grazing six 0.8-ha toxic-endophyte-infected (TE) tall fescue [Lolium arundinaceum
(Schreb.) S.J. Darbysh. = Festuca arundinacea Schreb., cv. Kentucky 31; KY31] was
compared with the nontoxic-endophyte-infected (NE) tall fescue cultivars Jesup MaxQ
(Pennington Seed, Madison, GA; n = 6) and Texoma MaxQII (Pennington
Seed; n = 6) either with N applied in autumn and spring (n = 3 pastures per cultivar)
or grown in combination with white clover (CL, Trifolium repens L.; cv. Regal Graze,
Producer’s Choice, Woodland, CA; n = 3 pastures per cultivar). Growing steers (n =
252, BW = 228 ± 4.2 kg in the autumn and n = 343, BW 229 ± 4.8 kg in the spring) were
stocked to pastures at 3.7 steers/ ha in the autumn, whereas initial stocking rates
were adjusted to match forage mass each spring. Enterprise budgeting was used to compute
net returns. Data in this 3 × 2 factorial arrangement were analyzed as a randomized
complete block design using year as the random blocking factor. Performance of steers
grazing NE was increased (P < 0.01) by 0.21 kg/d in the autumn and 0.57 kg/d in the
spring compared with TE. Clovers did not affect (P = 0.46) ADG in the autumn but increased
(P < 0.01) ADG in the spring by 0.2 kg/d; however, stocking rates and grazing days
per hectare were decreased (P < 0.01) with CL regardless of season. Interseeding CL
into KY31 pastures had no effect (P ≥ 0.41) on BW gain per hectare. Body weight gain
per hectare for NE was 79% greater (P < 0.01) than KY31, and NE tall fescue with N
produced 17% more (P < 0.01) BW gain per hectare than CL. Neither N nor CL affected
(P = 0.41) BW gain per hectare of KY31 pastures. Although CL pastures were not as
productive, net returns were increased (P < 0.01) because of reduced costs of production.
Using CL resulted in similar improvements in ADG for both TE and NE pastures. Profitability
of NE-based stocker programs was at a minimum 3 times greater than TE-based stocker
programs in any scenario.
Key words
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© 2012 American Registry of Professional Animal Scientists. Published by Elsevier Inc. All rights reserved.