1 Performance Modifiers. 2 The Problem After the realization that animals had a need for protein supplementation the livestock industry was still trying.
Published byModified over 6 years ago
Presentation on theme: "1 Performance Modifiers. 2 The Problem After the realization that animals had a need for protein supplementation the livestock industry was still trying."— Presentation transcript:
7 BST and the Cow Produced naturally in the pituitary gland, located at the base of the brain. Causes energy derived from feed to be used for milk production rather than for weight gain.
8 Without BST? Energy From Food GrowthMilk _____________________________________ With BST Energy from Feed GrowthMilk
9 Genetic Engineering & BST The advancement in technology has allowed for the manufacture of “recombinant bovine somatotropin” (rBST) The Food and Drug Administration approved rBST for use in November of 1993.
10 Administration of BST Recommendation: –Injections should begin 9 weeks after the cow has calved –Repeat injection every 14 days throughout lactation –Discontinue use 2 weeks before the end of lactation
11 What cows should have BST? The cow should be: –In good body condition –Gaining weight –Well managed –Fed a balanced ration with high quality forage
12 Which cows should NOT have BST? Cows with: –Poor health –Poorly balanced rations –Inadequate feed –High somatic cell count –Stress –Breeding problems
13 Benefits of BST? Increase milk production –5 to 15 pounds/day
14 Is it worth it? That is for the farmer to determine!
20 Making PST Successful Diet must consist of more protein and amino acids to support the increased growth rate.
21 Genetic Engineering & PST PST is produced in the pituitary gland at the base of the brain. Synthetically producing PST –Scientists have isolated the gene from the pig and inserted it into E. coli –E. coli then produces PST synthetically –The PST is then isolated and injected into the pig
23 Growth Implants Have been extensively used in beef production for over 30 years Can be used in cattle from 45 days old and up –Use of implants in NOT recommended for replacement heifers or breeding bull calves
24 Benefits of Growth Implants Suckling Calves –Improved weaning weights of 3-5% Feeder calves –Improved feed efficiency and gain of 5-15%
25 Implant Use Injected into the middle third of the back side of the ear Outside the cartilage ring at the base of the ear
26 Nutrition Is Key! Cattle must have adequate nutrition before the use of implants positively influences feed efficiency and gain
27 Problems with Growth Implants Carcass Composition –Heavy carcass weight with large frame, exotic cattle –Poor yield grades in heifers with certain types of implants –Poor quality grades if implanting schedules are not managed appropriately
28 The key to successful results from implants depend on… Good Management