INTERESTING EXPERIMENTS.

Dominion, Volume 6, Issue 1638, 3 January 1913, Page 8

INTERESTING EXPERIMENTS.

VARIATION- OP-TTIE COMPOSITION or COWS'MILK. .■ Some carefully . experiments ' .i' l '.connection;-with /'the';:variation:of ; the ~ of .coiv's; milk, ;with- ' : ihe aa--1 -vanco of .lactation have' been .conaiictod at' the Garforth farm. of. the University . ofLeeds, says the "Irish .Homestead:" The , .records extended.for three years, and in■cludo soventy . completed periods. of . lactation (31 cows),'.ofiwluch. fifty-seven, each ; extending over;six months',or more," have' .-;been.iused;.in compiling tho/tables given, : later. ..Careful-analyses were mado: The following is', the:' euiniiiary arrived .'at!—";. - With regard, to tho rate- at, which; tho ; s milk yield falls'vvith-iadvarice of lactation', our'.'records indicate, that after , the -first

i this is 'miich'more ; rapid 'in tho of cows, calviog 'iii 1 the . 'months: March., :to Juno than in the case' ! .of cows calv;ing'. v other :of the :year. The greatest average yield for the whole .period' of lactation j was obtained' • with cows. calving in January and ' -,■«i..'; *•-/. . \ ' : '-jWjth.regard'to charigesf in;the 'tiori ;of : 'milk';our;: tests 'have' brought. out ; fyei'y: clearly.".{he. fact 'that .the".'.variations' in. the .composition-of :inilk-with advance .'of iactation ; may,. differ greatly : in . the' case 1 :of •, the. different :■ r.aws, ; so' that: no JpreoiSo 1 'generalisation upon'-!, the subject ".can.- 1 be' ''"formulated.-,. , , • . Roughly speakiiig,' ''howbver, -the mi Ik ■is richest -in total.gohds,-fat, and albuTiuinoids. .in the earliest and 'latest stages j?f lactation :and. poorest,-about-.tho second i third month.: 'l'ho sugar content famds ;' to deoreuse steadily of lactation alter tho first m'ontli or'so, ;but tKe . jprbpijrtioii of ash remains approximately, constant