Canli Agirlik Research Articles

ESMER VE SİYAH ALACA BUZAĞILARIN BÜYÜME ÖZELLİKLERİ VE SÜTTEN KESİM ZAMANININ TESPİTİ

OZET: Bu arastirma Ataturk Universitesi Ziraat Fakultesi Tarim Isletmesinde yurutulmustur. Calismada, Esmer ve Siyah Alaca irk buzagilarin 500 g kesif yem tuketimine ulastiklari yas (gun) ve ihtiyac duyduklari besin maddelerini kaba ve kesif yemlerden karsiladiklari surenin tespiti amaclanmistir. 500 g kesif yem tuketimine Esmer irk buzagilar 36 gunde, Siyah Alaca irk buzagilar 38 gunde ulasmislardir. Esmer buzagilar, ihtiyac duyduklari besin maddelerinin kaba ve kesif yemlerden karsilanmasi 52, Siyah Alaca buzagilarda 55 gunluk yasta gerceklesmistir. Bu yasta, Siyah Alaca buzagilar gunluk 971 g, Esmer buzagilar gunluk 1033 g kesif yem tuketmislerdir. Calismada, Esmer ve Siyah Alaca irki buzagilarin dogum agirliklari arasindaki farklilik cok onemli (P<0.01), sutten kesim, 4, 6. ay agirliklari, sutten kesim sureleri ve gunluk canli agirlik artisi arasindaki farkliliklar ise onemsiz bulunmustur. Kuru madde olarak yemden yararlanma bakimindan Siyah Alacalar, Esmerlerden daha yuksek performans gostermislerdir (P<0.05). Anahtar Kelimeler : Buzagi, Esmer, Siyah Alaca, Sutten Kesim Yasi, Yem Tuketimi. DETERMINATION OF WEANING AGE AND GROWTH TRAITS OF BROWN SWISS AND HOLSTEIN FRIESIAN CALVES. SUMMARY: This research was carried out in the Farm of College of Agriculture at Ataturk University. The age of Brown Swiss and Holstein Friesian calves in which they reached 500 g concentrate feed consumption and duration in which they consumed enough hay and concentrated feed nutrient requirements were determined in this study. Brown Swiss and Holstein Friesian reached 500 g concentrate feed consumption in 36 and 38 days of age respectively. Brown Swiss and Holstein Friesian achieved the consumption of the sufficient amount of hay and concentrate to satisfy their nutrient requirements in 52 days old and 55 days old. In the same period, daily concentrate consumption of Holstein Friesian and Brown Swiss calves were 971 g and 1033 g respectively. The difference between birth weights of Brown Swiss and Holstein Friesian calves was highly significant (P<0.01), however, the differences concerning with weaning and 4 and 6 months were found to be insignificant. Holstein Friesian calves showed better performance than Brown Swiss calves in feed efficiency, as total dry matter consumption (P<0.05) Key Words : Calf, Brown Swiss, Holstein Friesian, Weaning Age, Feed Consumption

FARKLI SÜTTEN KESİM SÜRELERİNİN SİYAH ALACA BUZAĞILARIN BÜYÜME VE YEMDEN YARARLANMA ÖZELLİKLERİNE ETKİSİ

OZET: Bu arastirmada, Ataturk Universitesi Ziraat Fakultesi Arastirma ve Uygulama Ciftliginde yetistirilen Siyah Alaca buzagilar 30, 45 ve 60. gunde sutten kesilmis ve buzagilara icirilen gunluk sut miktari dogum agirliginin %7' si oraninda tutulmustur. Dogum - alti ay arasi donemde gunluk canli agirlik artisi ortalamalari 30. gunde sutten kesilen buzagilarda 0.52±0.01 kg, 45 gunluk sutten kesim grubunda 0.50±0.01 kg ve 60. gunde sutten kesilen buzagilarda 0.53±0.01 kg olarak saptanmis ve gruplar arasi farklar onemsiz bulunmustur. Arastirmada, toplam sut tuketimleri ve dogum - alti ay arasi donemde 1 kg agirlik artisi icin tuketilen toplam kuru madde miktarlari, 30. gunde sutten kesilen buzagilarda 61.8±4.81 kg ve 4.0±0.08, 45 gunluk sutten kesim grubunda 88.0±5.0 kg ve 4.0±0.09 ve 60. gunde sutten kesilen buzagilarda 132.0±5.0 kg ve 4.0±0.09 olarak belirlenmistir. Gruplar arasi farklar sut tuketiminde cok onemli (P<0.01), 1 kg canli agirlik artisi icin tuketilen kuru madde miktarinda ise onemsiz bulunmustur. THE EFFECT OF THE DIFFERENT WEANING AGES ON THE GROWTH AND FEED EFFICIENCY CHARACTERISTICS OF HOLSTEIN FRIESIAN CALVES SUMMARY: In this research, Holstein-Friesian calves reared in the Research Farm of College of Agriculture at Ataturk University were weaned at 30, 45 and 60 days of ages and the amount of milk fed the calves was calculated as %7 of the birth weights of calves. The average weight gains determined between birth and six month of ages for the calves weaned at 30, 45 and 60 days of ages were 0.52±0.01, 0.50±0.01 and 0.53±0.01 kg respectively. The differences among the groups were found to be insignificant. In this research, total milk consumption and total dry matter of the feed consumed for per kg weight gain in the period between birth and six month of age were 61.8±4.81 kg and 4.0±0.09 kg for calves weaned at 30 days of age, 88.0±5.0 kg and 4.0±0.09 for the calves weaned at 45 days of age, 132.0±5.0 kg and 4.0±0.07 for the calves in the 60 days group. The differences among the groups were highly significant (P<0.01) for the milk consumption, but they were insignificant for total dry matter of feed consumed for per kg weight gain.

İVESİ VE MORKARAMAN KOYUNLARINDA TRANSFERRİN (Tf) TİPLERİ İLE ÇEŞİTLİ VERİM ÖZELLİKLERİ ARASINDAKİ İLİŞKİLER

İVESİ VE MORKARAMAN KOYUNLARINDA TRANSFERRİN (Tf) TİPLERİ İLE ÇEŞİTLİ VERİM ÖZELLİKLERİ ARASINDAKİ İLİŞKİLER

FARKLI ANTİBİYOTİKLERİN YUMURTA TAVUKLARI VE KASAPLIK CİVCİVLERİN ÇEŞİTLİ ÖZELLİKLERİ ÜZERİNE ETKİLERİ

OZET Civciv rasyonlarinda 8 hafta sureyle, cesitli duzeylerde (0.00, '25,50,100 mg/kg yem) ampicilin, terramycin, c. bacitracin, erythromycin ve bakin sulfatin; tavuk rasyonlarinda ise 6 aylik periyotta, farkli duzeylerdeki (0.00, 25; 50,100 mg/kg yem) terramycin ve cinko bacitroc'in'in etkileri arastirilmistir. Sekiz haftalik periyotda, kontrol grubuna nazaran ampicillin, cinko bacitracin, terramycin, erythromycin ve bakir sulfath rasyonlarla beslenen gruplarda canli agirlik artisi sirasiyla % 658, % 7.38, % 9.7, % 857 ve % 5.3 nisbetlerde daha yuksek olmustur. Antibiyotikler ve bakir sulfatin civcivlerin yemden yararlanma ve yasama gucune etkileri farkli olmamistir. Yumurta tavuklarinda terramycin ve cinko bacitracin'in tavuklarin yumurta verimi, yumurta agirligi, yemden yararlanma ve yasama gucune etkileri istatistiki olarak Onemli bulunmamistir. Fakat antibiotik olan gruplarla yumurta agirligi, basal rasyonla beslenen grubunkinden onemli derecede dusuk bulunmustur, THE EFFECTS OF DIFFERENT ANTIBIOTICS ON THE VARIOUS PERFORMANCES OF THE LAYING HENS AND BROILER CIIICKS SUMMARY Two exp erime nt were conducted in order to de ter mi ne the effects of verious levels of ampicillin, terramycin, batcitracin, erythromycin and copper sulphate in broiler chiks; the effects of terramycin and zine bacitracin in layin hens. Only one control groupped factorlal experimental design of dectary treatments at four levels (0, 00, 25, 50, 100 mg/kg feed) of supplementary ampicillin, terramycin, zince bacitracin, erythromycin and cupper sulphate were studied in the first eiperiment. Day-old 14 male andfemale chick were randomly assigned to each of the dictory treatments The second experiment was rum with 22-weeks oldpulletsfor 6 months. Two replicated of 15 white leghorn pullets were randomyl assigned to diets containing various levels (O, 00, 25,50,100 mg/kgfeed) ofZine bacitracin and terramycin. In the flrst experiment (or in broiler chicks) there were no significant dijferences among the dietary treatments containing supplementary antibiotics and Cu-sulfate in regarding to eight-\veek body weight, feed efficienty and the survival rate. But the chicks receiving ampicillin, zinc bacitracin, terramycin, erythromycin and copper sulphate gained 658 %; 7.38 %; 9.70 %; 857 % and 5.30 % more body weight respectively ofthosefed basal diet. In the secont experiment (or in laying hens) the terramycin and the zinc bacitracin have no significantly effected on the egg producting, egg weight, feed efficiency and survival rate of the laying hensfor 6 mounths. But the egg weights of the groups receiving 25, 50 and 100 mg. of terramycin and zince bacitracin were significantly less than those receiving basal die

YAYIN (Silurus glarnis L.) VE CANER (Barbus c. capilo) BALIKLARININ AYNI ÇEVRE ŞARTLARINDAKİ BÜYÜME DURLMLARI VE ÇEŞİTLİ VERİM ÖZELLİKLERİNİN KARŞILAŞTIRILMASI

Ozet Bu arastirma, igdir Ovasi Karasu Cayinda yasayan yayin (Silurus glanis) ve caner (Barbus capito capilo) baliklarinin ayni ekolojik sartlardaki buyume ve gelisme durumlari ile cesitli verimlesini mukayeseli bir sekilde ortaya koymak amaciyla yapilmistir. Ayni ekolojik ortamda yasayan yayinlarin Canerlerden cok daha hizli gelistigi bulunmurtur. Ortalama kondusyon katsatyisi yayinlarda 0.60, canerlerde ise 0.85 olarak hesaplanmistir. Her iki balik turu arastirmanin yapildigi ekolojik sartlarda Mayis-Haziran aylarinda yumurtlamakta ve ayni yaslarda cinsi olgunluga ulasmaktadirlar. Yayinlarin yumurta verimleri (12700 adet ikg. canli agirlik), Canerlerinkinden (8300 adetlkg. canli agirlik) daha yuksektir. Yumurta buyuklugu de yayinlarda fazladir {yayinlarda ortalama 2.5 mm, canerlerde 2 mm). Canli agirlik-ovaryum agirligi, canli agirhk-yumurta sayisi ve ovaryum agirligi- yumurta sayisi arasinda her iki balik turunde de yuksek duzeyde ve pozitif yonde iliskiler bulunmustur. Ovaryum agirliginin canli agirliga orani yayinlarda % 8.5, Canerlerde ise % 4.5 olmustur. Kilcikli et verimi yayinlarda % 60.0, Canerlerde % 65.25 bulunmustur. Organoleptik muayenede Caner baliklarinin etleri yayinlarinkinden daha lezzetli ve kokusuz, fakat kilcikli bulunmustur. Yayin etinde hosa gitmeyen hissedilebilir koku tesbit edilmistir. Summary A Comparative Study on The Growth Rate and Various Characteristics of Sheatfish (Silurus glanis L.) and Caner Fish (Barbus Capito Capito) lived in the Same Habitat of Karasu Stream In Igdir Plain. This study was carried out to compare the growth rate and the various permans of y iym (Silurus glanis) and Caner fishes (Barbus capito capiio) lived in the same habitat of karasu stream in Igdir plain. In the sume ecological conditions yayin fish growed faster than Caner fish. The coefficient of the condition was found 0.60 in yayin fish and 0,85 in Caner fish. Both yaym and Caner fishes spawned between May and July and reached the sexual matirity at the same ages. Famale fihes of yaym and Caner produced 12700 and 8300 eggs/kg. fish weight, respectively. The average diameter (egg size) of eggs of yaym fish was larger than Caner fish (2.5 mm. in yayin fish, and 2 mm. in Caner fish). 9 The relationships between the body weight-ovary weight, the body weightegg number and ovary weight-egg number were also studied in this study. It was found that there were highly positive corelations between these criteria s, mentioned above, in both fish species. The ratio of the ovary weight of yayin and canner fishes to the body weight was calculated as 8.5 %, and 4.5 %, respectively. The percentages of the boned carcass weight were determined in yayin and caner fisher are found as 60.00 % , and 65.25 %, respectively. Some organoleptic and physical characteristics of the meat taken from the different fishes were examined. The differences in tenderness, juiciness, cooked meat color indflivour, odor and bone situation were found in tne meats of these fishes. Caner fish poroduced good quility meat from the stand point of organoleptic and physicad traits. But,, the ratio of bone in this fish was found higher than yaym fish. From the above results, it was concluded that both yayin and caner fishes were very suitable for aquaulture.

IĞDIR OVASI KARASU ÇAYINDA YAŞAYAN YAYIN BALIKLARININ (Silurus glanis L.) BÎYO -EKOLOJİSİ VE EKONOMİK DEĞER TAŞIYAN BAZI VERİMLERİ ÜZERİNE BİR ARAŞTIRMA

ozet Arastirmada yayinlarin dogal ortamlarindaki geleme durumlarim anlamak icin yas-boy, yas-agirlik ve boy agirlik arasindaki iliskiler uzerinde durulmustur. Ortalama konlusyon katsayisi (A) 0.58 bulunmustur. Igdir ovasinda yayinlarin ureme zamani Mayis-Haziran aylarina rastlamaktadir. Bu ekolojik sartlarda yayin baliklarinin erkekleri 2-3, disileri ise 3-4 yaslarinda cinsi olgunluga ulasmaktadirlar. Yayin baliklarinda canli agirlik-ovaryum agirligi, canli agirhk-yumurta adedi ve ovaryum agirligi-yumurta adedi arasinda pozitif iliskiler bulunmus ve bu karekterler arasindaki korelasyon katsayilari ise sirasiyla r=0.88, r=0.77 ve r~0.80 olarak hesaplanmistir. Yayinlarin bas, ic organlar (gonad, dahil), yuzgec, deri ve karaciger gibi vucut kisimlarinin canli agirliktaki paylari sirasiyla % 18,65, °/0 14.98, % 4.03, % 3.89, % 0.08 bulunmustur. Bu baliklarda ortalama kilcikli et randimani ise % 56 civarinda olmustur. Yapilan hesaplamada eldeki materyalin kg canli agirlik basina 12340 adet yumurta verdigi ve ureme mevsimindeki ortalama yumurta capinin 2.5 mm. civarinda oldugu bulunmustur. Summary A Study on the Bio-Ecologica! and Economical Properties. of The Sheatish (Silurus glanis Lo) Lived in the Karasu Stream in lgdir Planin In this research, the bio-ecological and some economical performans of Silurus glimis L. (Sheatfish) lived in Karasu Stream in I~dJr Plain of the Eastem Anatolia were studied. The relationships between the length-weight, age-weight, and agelength were determiiied to understand the rates of growth of Silurus gIan;s lived in natural en vironmenL Length of fishes may be determined with accuracy. Weight of fisbes may be considered a function of the length. This relaliouship of the length and weigbt was calculated by using the following formula. Log W = logc + n log L. in whicb W = weight, L= length, C and n = eonstans (RownsefelI and Everhart, 5983), In addition, by usage the eoefficient of eondition K is determined by the following formula: W K= -........,,......- x 100, in Which L3 W= Weight in grams, L= total length in centimeters. The eoefficient of condition in Silurus glanis was found as 0.58. This value is lower than tbat of other fish species. Beeause the body shape of SHurus glanis is very long and thin. For this reason, tne eoeffient of eondition (K) has been found significat1y low in Silurusglanis. The regression and eorelation eoefficients between the body weigbt-ovary weight, body weight-egg number, and ovary weight-egg number \Vere also ealculated. The corehtion coefficients between these criteri::i.s, mentioned above, were r= 0.88, r = 0.77, and r= 0.80 respectively. The ayarage diameter of eggs (egg size) was around 2.5 mm. in the reproduction seson. Silurus glanis in our researeh habitant produced 12340 eggs/kg. fish weight. Male and female reached sexual inaturity at between 2-3 of age, and 3A of age respective1y. Spawning season of Silurus Gl.anis is between May an July In Spring. In this work, th.e me:rt yiled of Si/urus glanis was studied too. the rr-.tio of some organs to the body weight were found as fol1ows; The head wcight to the the body weight =18.65 %; gut weight to th~ body weight = 6.50 %, rins weight to the body weight = 3.89 %; skin weight to the body weight = 4.03 %; ovary weight to the body weight=9.00 %; ,nd liver weight to the body weight=O.85 %; the net carcas weight (without skin, but boned) to the body weight=56 %.

ERZURUM ŞARTLARINDA MER'AYA İLAVE OLARAK VERİLEN FABRİKA YEMİ ve AMONYUM NİTRATU FABRİKA YEMİNİN BUZAĞI VE TOSUNLARIN PERFORMANSLARINA ETKİSİ

OZET Bt{ arastirma, Erzurum sartlarinda mer'ada otlayan genc sigir/aNn, hangi devreden itibaren kesif yemle takviye edilmeleri, bu takviyenin hangi duzeyde yapilmasi gerektigi re farkli irkiada, melezIerinin mer'adan faydalanma kabiliyetlerinin tesbitini amaclamaktadir. Bu maksat/a 3-6 aylik 25 bas erkek buzagi ve 6-12 aylik 31 bas tosun yaslari, irklari ve vucut agirltkiarma gore, uc muameleye sansa bagli olarak dagitilmislardrr. Ml/ameleleri, I. sader'e mer'a, 2. meraya ailaveten yem sanayi buzagi buyutme yemi (% 18 ham proteinli}ve 3. muameleyi de amoyum nitrtlt/i buzagi huyutme yemi (% 26 ham proteirili) teskil etmistir. Adi gecen kesit yemler 3-6 aylik buzagilara 2. ve 3. muameleler icin gunde hayvan basina 400 gr.. 7-12 aylik tosun/ar icin gunde 800 gr. duzeyinde o/mak uzere. hayvan/ar aksam mer'adan dondukten sonra l'eriJmis.tir. Hayvanlar gunde iki defa sulanmis ve her ]4 gunde bir tartl/rnis/ardir_ DenemR 47 gun surmustur (i 6 Temmuz-9 Ekim' 1975). Gerek 3-6 aylik huza/blarda ve gerekse 7-1.2 aylik tosun/arda 2. ve 3. muamelelerdekiler, i. muamele/erdekini1en i5n<'mfi (P < 0,05) mik. tanki daha fazla canli agirlik artisi kazarimislardir.3·6 ay/ik buzagi/ar arasinda Esmer Isvicl'e/er ve Esmer 'svicre x Do.gu Kirmizi Melezierinin mer'adan yarar/anma diizey/eri hel' uc muame/ ede de Dogu K~rmizi/ardandahafaz/ao/mus.tur. 7-12 aylik tosun/arda ise, Esmer bicre'lerin meradan yarar/anma duzey/eri, hem Esme,. iSvicre x Dogu kirmizi me/ezlerindefr, hem de Dogu Kirmm'ardan daha fazla olmustur. Butun bulgu/ar ince/ernp ekonomik analiii yapildiginda, 15 Agustos tariJtbiden itibaren mer'ada otlayan hayvan/arin kesifyem/e tdkviyesinin, gerektigi ~'e bii takviyenin net kan yukseltitigi sonucuna varilmistir. SUMMARY The Effects of Pasture Supplementation With Concentrates and Ammonium Nitrate Added Concentrales on Steer-Calves and Yearlings Pasture supplemantation during summer was studied in order to determine the optimum level of supplementation, gain trends on summer pasture and feed utilization of different breeds of calves and yearling steers,. 25 head of 3 to 6-month old calves and 31 heads of 7 to i 2-month old yearling steers were randomly assigned to 3 treatments according to their breeds, age and body weights·. Treatment- i was control group with no supplementation, second treatment was pastur~ plus concentrate (l8 % crude protein) and the third one was pasture phis ammonium nitrate ad<!ed proteiii concentrate (26 % crude protein). SuppIementation levels were 4UO gm/day for 3 to 6- month old calves and. 800 gm/day for 7 to ii-month old of age steers for both protein concentrate and ammonium nitrate added protein concentrate. BQth concentrates were fed once a day, in the evening. Animals were watered twice a dayand weighed in every 14 days during experimental period. There was a significant (P < 0,05) adva,ntage in weight gain's feeding of the two additional concentrates in both calves and steers as compared to those control gwups. However, ammonium nitrate added concentrates were slightly inferior to those concentrates without ammonium n.itrate. The breeds Were Brown Swiss, Brown Swiss x Red Anaiolian erosses and Red Anatolians. The frist two used the pasture more efficiently than those Red Anatolians in 3 to 6-month old calves. However, in older groups, 7 to l2-month old steers, only Brown Swiss steers were significanily superior to botb Bwrown Swiss x Red Anatolian Crosses and Red Anatolians. Pasture supplerrientation with 400 and 800 grams of concentrates was economical and improved the financial rehiros in calve and yearlings respectively. From all thcse data it was conetuded that pasture should be suppJementcd with concentmtes espeeiaUy after 15 tli of August in Erzurum area. This is going to increase the net ineome.

VİTAMİN-K ANALOGLARlNIN TAVUKLARDA PLASMA PROTROMBİN ZAMANI ÜZERİNDEKİ ETİKİLERİ

OZET Bu calismada, bazal diyete ilave olarak verilen vil-Ki:, /K2; K3 kaynaklarinin civciv, pilic ve tavuklarda plasma protrombin zamani uzerine olan etkisi arastirilmistir. Vitamin-KI kaynagi olarak % 5 unu vitamin Ki kaynagi olarak % 5 balik unu ve K3 kaynagi' olarak %40 sari misir kullanilmistir. Plasma protrombin zamani tayininde Tek Devreli Q'ulci( Metodu ve trombokinase tab/etleri kullanilmistir. Kullc.nilan vitamin-K kaynaklari ile bunlarin sagladigi plasma protrombin zamanlarinin yemden faydalanma sayisina ve canli agirlik drtfsma onemli bir etkide bulunmadikIdri, baska bir tabirle plasma protrombin zamtmlari ite yemden faydalanma sayisi ve canli agirlik artisi arasinda onemli bir ilgi bulunmadigi gorulmustur. Disi/erde 8. inci haftada vitamin-K2 vitamin KI ve K3 ten, 18: inci haftada ise vitdmin-K2 ve vitamin-KI ayri ayri vitamin-K3 ten daha az aktivite gostermistir. 24 ve 30. uncu haftalarda ise butun vitamin-K formlari benzer aktivite gostermislerdir. Erkeklerde butun periyotlarda vitamin-k aktivitesi bakimindan onemli bir farklilik gorulmemistir. Vitamin-K kaynagi olarak 18. inci haftaya kadar san misir, geri kalan periyotta ise balik unu, yonca unu veya sari misirdan herhangi birinin kullanilabilecegi anlasilmistir. Vitamin-KI kaynagi disi/erde 22.1 erkeklerde 21.6, vitamin-K2 kaynagi disi/erde 23.70 erkeklerde 22.~, vitamin-K3 kaynagi ise disilerde 18.8 erkeklerde 20,2 saniyelik bir protrombin zamani temin etmistir. Fakat, cinsiyet portrombin zamani uzerine onemli bir etkide bulunmamistir. Normal protrombin zamani olarak 20 saniye alindiginda balik unu ve yonca ununun rasyondaki miktarlarini artirmak sari misirin miktarini ise azaltmak gereklidir. Fakat, bu durumun tespiti icin yeni arastirmalara ihtiyac vardir. The Effects of Vitamin-K Analoques On The Plasma Prothrombine Time In Chicks. Broilers and Adult Hens The influmce of the sources of vitamin-KI, vitamin-K2 ~nd vitamin-K3 on the plasma prothrombin time of chickens' jn the growing, broiIer and laying periods has been researched in this study. As a source of vitamin·Kl 5 percent of dehydrated alfalfa meal was used in the diet and 5 pereent fish meal for vitamin- K2 and 40 percent yellow com for vitamin-K3. 150 white Leghom chicles were distributed according to block assignment method on the wire floor,electricalJy he· ated .petersime type battery, feed and water were applie,d as free cboise. Plasma prothrombine time were a· nalysed according to Quick method and thrombokinane pills were used. There is no significant influence of plasma prothrombine time on the growth rate and feed effieieney. The sources of vitamin-Kihas shown less activity than the_ other sources of vitamin-KI and Lo in eight week on the female chicken. The activities of the sources of vitamin-KI and Lo has shown almost equal activity. it has been.observed that the sources of vitamin-lO has more activity than the other sources in 18 th weekperiodin ferrnale chickens. There is no statistically important difference between the activities of the sources of vitamin-KI and Lo in this period. it also not been observed any important difference among the sources of vitamin-K forms in the periods of 24 and 30 th weeks. All sources of vitamin K forms, have not effected difIerently on the plasma prothrombine time of the male chickens during the whole period of the experiment. Obtained data indicated that, there is no need to use other than yellow com as a source of vitamin K until 18 th weeks. We suggest that fish meal, alfafalfa meal and yellow com can be Used during the later periods. we found that the sources of vitaminKI has given 22.1 seconds pJasma prothrombine timein female, and 21.6 seconds in male chickens. The sources of vitamin K2 has given 23.7 seconds in female and 22.0 seconds in male and the source of vitamin K3 has given 18.8 seconds in female and 20.2 seconds in maIe. These data indicate that there is no significant influence of sex on the plasma prothrombine time. But, in comparison with normal plasma prothrombine' time which is accepted as 20 seconds. we suggest that fish meal and alfalfa meal must be increased in some extent in the diets. But we need further investigation in how extend it must be increased.