Internet Payments

Secure & Reliable

Your data is encrypted and secure with us.
Godaddyseal image
VeraSafe Security Seal

Lethbridge Herald Newspaper Archives

- Page 21

Join us for 7 days to view your results

Enter your details to get started

or Login

What will you discover?

  • 108,666,265 Obituaries
  • 86,129,063 Archives
  • Birth & Marriages
  • Arrests & legal notices
  • And so much more
Issue Date:
Pages Available: 64

Search All United States newspapers

Research your ancestors and family tree, historical events, famous people and so much more!

Browse U.S. Newspaper Archives


Select the state you are looking for from the map or the list below

OCR Text

Lethbridge Herald, The (Newspaper) - May 30, 1972, Lethbridge, Alberta y, Moy 30, }971 THE LETHBillDGE HERALD 19 New replacements for DDT may not fill need L By Dr. 0. IIAI'FE Lclhbriclgp Research Slalion Until recently, livestock pest control has relied on Ihc use ol a few inexpensive insecticides such as DDT and toxaphene. Restrictions in the use of these compounds have been accepted with the premise that newer compounds with equal or better efficacy would be available as acceptable replacements. Experience with the newer compounds is beginning to in- dicate that they may not pro- vide the desired results. In many cases the residue prob- lem has been traded for other problems such as increased tox- Icity, side reactions, and var- ious interactions with growth processes and reproduction. The replacement compounds, on closer scrutiny, have severe limitations under which they can be used. Their effect on reproductive processes in ani- mals, for example, may cause problems in a cow herd it some of the compounds are used dur- ing conception, pregnancy, par- turition, or the immediate post- natal period. Some compounds may slow growth processes and thus may be uneconomic for use on cer- tain classes of immature ani- mals, especially when frequent applications arc required and (he lime to reach market weight is a critical factor in tire effi- ciency of (he management pro- cedure. The performance of some newer compounds has been evaluated on catllct at the Lcth- bridge Research Station to dis- cover suitable replacements for DDT. Many have been found to be highly effective against the par- asite but are uneconomical. Most are more expensive than the older ones. Some temporar- ily decrease the rale of gain so that a longer feeding per- iod is required to produce the finished weight. Although treatment with DDT may leave objectionable resi- dues, it had the advantage of providing parasite control on animals with relatively Little ef- fect on v.'eight gains. There- fore, j-cplacemenl pesticides with equal or better efficacy against parasites are compared with DDT as a baseline for economically acceptable per- formance. Several organophosphor- us compounds have failed to meet the requirements for fly control in this respect. Mc-lli- oxychlor, an organochlorine compound, however, has com- pared favorably with DDT both in performance of cattle on pas- ture and in effective control of flies. Since it also degrades more rapidly than DDT, it should become the pesticide of choice in multiple treatments to control biting flies and other annoying pests on grazing cattle in summer. MOW ON DISPLAY AT T-n-T EQUIPMENT LTD. 4726 1st Street, Claresholm THE NEW MF 124 BALER! This new Massey-Fcrguson 124 baler gives you lighter, belter-looking willi Granger knots plus more capa- city 1o gel your baling done like clockwork. Exclusive Surefie knofler is the mosl reliable on ihe market with 30% fewer parls. Takes oil plastic or sisal Iwine no need for adjustment. The MF 124 is an eager eater. 56" pickup handles heaviest windrows. Whopping big 293 square inch throat opening among the biggeal in the industry. This is one 14" x 18" baler lhat can give many 16" x IB" models a run for their money. And like oil Massey balers, the MF 124 can make bales without a single stop for greasing For baling at its best, see the new MF 124 Baler right nowl Wire tie MF 126 also available. Come on over I Say "Tennesioe Ernie" lent you for a look-seel Phone DON GREEN 235-3623 or 235-3193 In CLARE5HOLM EQUIPMENT LTD. SIMPSONS-SEARS Wedkeitdl DELUXE HARDTOP CAMPER Make Simpsons-Sears Your headquarters For all your Camping Accessories Beautiful hardtop camper sleeps six people comfortably with the beds converting to comfortable scats. It lias full ztppered windows, ice chesf and dome light. The table can be used Inside or out. Also has two full size covered mattresses. Heavy channel iron bumper and wide oval tirej. SIMPSONS Sears SPORTS CENTRE STORE HOURS: Open Dr.ily 9 a.m. to p.m. Thursday and Friday 9 a.m. fo 9 p.m. Cenlro Village. Telephone 328-9231 ;