Feed Gorging and Extended Water Restriction Do Not Produce Knockdown in Male Turkeys Fed Monensin

Watkins, Kevin; Novilla, Meliton N.

doi:10.3382/ps.0730587

Cited by 4 publications

(1 citation statement)

References 5 publications

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“…This study confirms previous observations that the early short-term administration of antibiotics or MON in the recommended doses does not compromise the growth performance of birds ( Watkins et al, 1993 ; Watkins and Novilla, 1994 ; Chapman and Saleh, 1999 ; Sureshkumar et al, 2013 ). However, Madubuike et al (2020) reported that DOX administered in early life to vaccinated chickens decreased their BW gain.…”

Section: Discussionsupporting

confidence: 91%

Gastrointestinal tract and neuroendocrine system responses of young turkeys to the early administration of antibiotics or feeding a diet containing a coccidiostat

Mikulski¹,

Ognik²,

Zduńczyk³

et al. 2022

Poultry Science

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Section: Discussionsupporting

confidence: 91%

Gastrointestinal tract and neuroendocrine system responses of young turkeys to the early administration of antibiotics or feeding a diet containing a coccidiostat

Mikulski¹,

Ognik²,

Zduńczyk³

et al. 2022

Poultry Science

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Alterations in Levels of Various Host Antioxidant Factors in Turkey Knockdown Syndrome

Meldrum¹,

Evans²,

Robertson³

et al. 2000

Avian Diseases

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Five components (selenium, glutathione peroxidase, copper, superoxide dismutase, and vitamin E) of the antioxidant system of turkey poults were examined to determine if they play any role in the knockdown (KD) syndrome. All flocks were provided with feed formulated to contain monensin at 54-60 g/ton. Flock data were analyzed as a case-control study with three treatment groups (KD-affected and unaffected turkey poults from a KD flock and poults from an unaffected flock [control]). Affected turkey poults had lower (P < 0.001) serum vitamin E levels compared with unaffected poults from KD flocks or poults from unaffected flocks. No significant differences were observed for the other parameters evaluated but there was a trend towards lower copper and superoxide dismutase values in affected birds. It appears that serum vitamin E concentrations in turkey poults may play a significant role in susceptibility to or protection against KD syndrome. Other components of the antioxidant system may also be involved, and complex interactions among several body systems may be critical.

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Turkey Knockdown in Successive Flocks

Evans¹,

Edson²,

Watkins³

et al. 2000

Avian Diseases

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Turkey knockdown was diagnosed in three of five flocks of hen turkeys on a single farm within a 12-mo period. The age of birds in the flocks affected ranged from 6 wk 2 days to 7 wk 4 days. The attack rate ranged from 0.02% to 0.30% with a case fatality rate in affected birds ranging from 0 to 74%. The diagnosis was made on the basis of clinical signs and histopathologic lesions associated with knockdown. The feed in all flocks contained bacitracin methylene disalicylate and monensin (Coban). Affected birds were recumbent, demonstrated paresis, and were unable to vocalize. Postmortem examination revealed few significant lesions although pallor of the adductor muscles and petechiation in adductor and gastrocnemius muscles were noted. Birds that had been recumbent for extended periods were severely dehydrated. Consistent microscopic lesions included degeneration, necrosis, and regeneration of adductor, gastrocnemius, and abdominal muscles. No lesion in cardiac tissue was noted. Results of our investigation indicated that changes in water consumption, vitamin E status, and brooder to finisher movement correlated with the occurrence of knockdown. Turkey knockdown was defined in 1993 as any condition identified in a turkey flock that has affected the neuromuscular system to a degree that a turkey is unable to walk or stand. This definition was later modified to...neuromuscular or skeletal systems to a degree that a turkey is unable to walk or stand properly. Knockdown may be associated with numerous feed, management, or disease factors alone or in combination. Dosage of monensin, feed restriction/gorging, water restriction, heat stress, copper, mycotoxins, sodium chloride in feed, and sulfa drugs have all been suggested as contributing factors; however, laboratory studies to duplicate this have not been successful. This report presents observations from a single farm at which three of five hen flocks in a single year experienced knockdown. When a flock was reported as affected, a detailed investigation was initiated within 3 hr. The fifth flock was followed on a twice weekly basis from 0 to 8 wk of age to determine if initiating events were evident, but knockdown did not occur.

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Feed Gorging and Extended Water Restriction Do Not Produce Knockdown in Male Turkeys Fed Monensin

Cited by 4 publications

References 5 publications

Gastrointestinal tract and neuroendocrine system responses of young turkeys to the early administration of antibiotics or feeding a diet containing a coccidiostat

Gastrointestinal tract and neuroendocrine system responses of young turkeys to the early administration of antibiotics or feeding a diet containing a coccidiostat

Alterations in Levels of Various Host Antioxidant Factors in Turkey Knockdown Syndrome

Turkey Knockdown in Successive Flocks

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