Effect of chronic lead intoxication on the distribution and elimination of amoxicillin in goats

A study of amoxicillin pharmacokinetics was conducted in healthy goats and goats with chronic lead intoxication. The intoxicated goats had increased serum concentrations of liver enzymes (alanine aminotransferase and gamma-glutamyl transferase), blood urea nitrogen, and reactivated delta-aminolevulinic acid dehydratase compared to the controls. Following intravenous amoxicillin (10 mg/kg bw) in control and lead-intoxicated goats, elimination half-lives were 4.14 and 1.26 h, respectively. The volumes of distribution based on the terminal phase were 1.19 and 0.38 L/kg, respectively, and those at steady-state were 0.54 and 0.18 L/kg, respectively. After intramuscular (IM) amoxicillin (10 mg/kg bw) in lead-intoxicated goats and control animals, the absorption, distribution, and elimination of the drug were more rapid in lead-intoxicated goats than the controls. Peak serum concentrations of 21.89 and 12.19 microg/mL were achieved at 1 h and 2 h, respectively, in lead-intoxicated and control goats. Amoxicillin bioavailability in the lead-intoxicated goats decreased 20% compared to the controls. After amoxicillin, more of the drug was excreted in the urine from lead-intoxicated goats than the controls. Our results suggested that lead intoxication in goats increases the rate of amoxicillin absorption after IM administration and distribution and elimination. Thus, lead intoxication may impair the therapeutic effectiveness of amoxicillin.

Craniofacial ossification in rat fetuses following prenatal exposure to dimethoate and carbosulfan insecticides

Pesticides, including insecticides, occupy a unique position among many chemicals that man encounters daily for the purpose of pest control in all agricultural programs. In fact, most of such chemicals are not highly selective and constitute potential hazard to many non-target species including man and other animals. The present study aimed to study the teratogenic effects of both dimethoate and carbosulfan insecticides on the ossification of craniofacial bones in albino rat fetuses. In this study, fifty female albino rats were allocated to ten groups [5/each group]; control, low dose dimethoate 1/40 LD50 [8.25 mg/kg], medium dose dimethoate 1/20 LD5O [16.5 mg/kg], high dose dimethoate 1/10 LD50 [33 mg/kg], low dose carbosulfan 1/40 LD50 [5.2 mg/kg], medium dose carbosulfan 1/20 LD50 [10.45 mg/kg], high dose carbosulfan 1/40 LD50 [20.9 mg/kg], mixed low doses of dimethoate and carbosulfan, mixed medium doses of dimethoate and carbosulfan, and mixed high doses of dimethoate and carbosulfan. Animals of all groups were sacrificed in the morning of 20[th] day of gestation. Then all specimens were stained with alizarin red stain for evaluation of ossification of skeletal system. The results of the present study revealed that both dimethoate and carbosulfan insecticides, had a deleterious effect on the ossification of craniofacial bones and that the most affected bones were supraoccipital, presphenoid, and interparietal bones. These effects were marked in the high doses and mixed low dose groups. It is concluded that the deleterious effects were increased with the increasing dose of either dimethoate or carbosulfan insecticides and that the mixture of low doses had an effect near to that of medium and sometimes high doses

Teratogenic effects of dimethoate and carbosulfan insecticides on albino rat fetuses

The present study deals with the teratogenic effects which occur in albino rat fetuses after intragastric administration of different doses of dimethoate and carbosulfan insecticides, either separately or in combination, to pregnant albino rats. In this study, fifty female albino rats were allocated to ten groups [5/each group]; control, low dose dimethoate 1/40 LD50 [8.25 mg/kg], medium dose dimethoate 1/20 LD50 [16.5 mg/kg], high dose dimethoate 1/10 LD50 [33 mg/kg], low dose carbosulfan 1/40 LD50 [5.2 mg/kg], medium dose carbosulfan 1/20 LD50 [10.45 mg/kg], high dose carbosulfan 1/40 LD50 [20.9 mg/kg], mixed low doses of dimethoate and carbosulfan, mixed medium doses of dimethoate and carbosulfan, and mixed high doses of dimethoate and carbosulfan. All pregnant females in mixed medium doses of dimethoate and carbosulfan group died between 9th and 11[th] day of gestation, while those in mixed high doses of dimethoate and carbosulfan died between 8th and 10[th] day of gestation. Animals of all groups were sacrificed in the morning of 20th day of gestation. The external manifestation of poisoning with dimethoate and carbosulfan, embryolethality, live and dead fetuses, placental weight, external abnormalities of fetuses, fetal weight, crown-rump length, biparietal diameter had been monitored. The results of the present study denoting that both dimethoate and carbosulfan insecticides, had a deleterious effects on embryolethality in the form of increased percentage of preimplantation loss, an increased percentage of resorptions, and decreased percentage of live fetuse. Also, both dimethoate and carbosulfan insecticides had a deleterious effects on fetal growth in the form of reduction of, fetal weight, crown-rump length, and biparietal diameter. It is concluded that dimethoate and carbosulfan insecticides had a deleterious effects on fetal growth and embryolethality, this effect is dose-related, and that the mixture of low doses had an effect near that of medium and sometimes high dose of dimethoate and carbosulfan insecticides

Relationship between body condition, milk yield and reproductive performance of dairy cows

To study the relationship between body condition, milk yield and reproductive perfomance of highly producing dairy cows under local conditions, a number of 287 Holstein-Friesian cows, in their 1[st] to 5[th] lactation were used. Animals were grouped according to their milk production and fed on a total mixed ration according to NRC 1989. All cows were evaluated subjectively for body condition score [BCS] at calving and at service. Linear regression coefficient of interval from calving to 1[st] estrus [Y1] on peak milk yield/kg/day [X1] was significant [P < 0.01]. The resulting equation was Y1=16.37+0.7X1. Cows with higher peak milk yield showed a significant long interval to 1[st] detected estrus. No significant linear regression was found between milk yield/kg during current lactation and reproductive traits. Linear regression coefficient of interval from parturition to 1[st] detected estrus [Y1] on BCS at calving up to score 4.0 [X2] was significant [P < 0.01]. The resulting equation was Y1=90.52-20.68 X2. Cows with high BCS at calving up to score 4.0 had significantly [P < 0.05] shorter interval to 1[st] detected estrus. Meanwhile, linear regression coefficient of days open [Y2] or number of services/conception [Y3] on BCS at service [up to score 3.5] [X3] was also significant. The resulting equations were Y2 = 293.59 - 66.47 X3 and Y3=5.13-1.056 x 3, respectively. Both days open and number of services/conception were significantly improved as BCS at service was increased up to 3.5. The present work revealed that, reduced fertility in highly producing cows is not directly related to increased milk yield but rather to loss of weight and body condition. It is worthy to mention that the equations used here are helpful to predict the reproductive perfomance of a given cow by means of peak milk yield and/or BCS